Why Hyperlexia Often Gets Overlooked or Misidentified

Reasons why hyperlexia often gets overlooked or misidentified.

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Most people haven't heard of hyperlexia before. As a result, it's not surprising when parents mention hyperlexia to doctors, specialists, or their child's pediatrician, that they hear things like:

"I've never heard of that!"

"Oh, that's just autism..."

"How is early reading a problem?"

It's dismissive comments like these that make it challenging for parents to get their child identified and find proper support, which leaves many parents feeling lost, isolated, discouraged, and unheard. They often feel frustrated and exhausted, tired of constantly having to advocate against people who don't (or won't!) listen.

Not only does hyperlexia often get overlooked and dismissed in these ways, but it can frequently be misidentified, misdiagnosed, misunderstood, or missed altogether.

Either way, hyperlexic kids and their families often don't get the support they need as a result.

So let's take a closer look at why hyperlexia often gets overlooked or misidentified.

Reasons Why Hyperlexia Often Gets Overlooked or Misidentified

There are a number of reasons why hyperlexia is frequently missed or overlooked, which we will go into much more detail below. The most common reasons are:

• Lack of awareness

• It's not an official diagnosis

• It overlaps with other labels and diagnoses

• Lack of a standardized definition and diagnostic criteria

• It's often dismissed as a splinter skill or viewed as unimportant

• Advanced decoding can mask the struggles

• The giftedness bias (and its flipside)

• Gestalt language processing gets mistaken for advanced verbal fluency

• The "wait and see" approach

• Co-occurrence leads to misdiagnosis

Now, I want to give you a heads up that there is a lot of information, quotes, and references coming your way below. So brace yourself, I guess...because this one's long and detailed!

1. Lack of Awareness (aka People Don't Know it Exists!)

First and foremost, most people haven't even heard of hyperlexia before so people simply don't know it exists. And yes, this applies to professionals such as speech therapists, pediatricians, and doctors who are often the first touchpoint in the diagnosis journey. So part of the reason hyperlexia gets overlooked or missed, is because it's not even on their radar yet.

Things are even more dire outside of North America, where hyperlexia is so rarely heard of. Parents have shared with me that countries like Denmark, Germany, Brazil, Pakistan, and the UK seem to be quite behind regarding hyperlexia and that information on hyperlexia is extremely limited.

As David (2024) pointed out, hyperlexia is "a phenomenon not very well known among education and mental health professionals, and much less among the public." And that is very much true to my own experience. Even after writing and sharing about hyperlexia online for 10+ years, I still get messages and comments along the lines of, "So that's what it's called!" or "I've never heard of this before!"

2. It's Not an Official Diagnosis

Another reason why hyperlexia often gets overlooked or misidentified is because it's not an official standalone diagnosis. (Canadian Hyperlexia Association; Hyperlexia: Therapy that Works Manual)

In other words, it's "not a formal diagnosis in the DSM-IV or in any other official diagnostic manual" (Asberg Johnels et al., 2019), "nor is it a distinct syndrome described in the DSM-5" (presentation by Kupperman, 2018). You also won't find it listed in the DSM-IV-TR or ICS-10-CR (Chia et al., 2009) and it isn't "listed as an identified category in the Individuals with Disabilities Education Act (IDEA)." (Murdick et al., 2004)

Perhaps if it was an official, formal diagnosis in a diagnostic manual, there would be less confusion about hyperlexia as a whole.

3. It Overlaps With Other Labels & Diagnoses

There's also a lot of hyperlexic traits that overlap with other neurodivergent profiles. You might already be familiar with the fact that "hyperlexia shares several characteristics with autism." (Al-Okby & El-Behairy, 2025). 

For instance, the cognitive profile of hyperlexia is "strikingly similar to [that] often seen in autistic individuals." (Nation, 1999). Furthermore, the difficulties in speech, language, and communication "inherent in hyperlexia are the same as those typically reported in autism." (Nation, 1999).

As another example, Cohen et al. (1997) noted that, "the primary and essential cognitive feature of Hyperlexia is Specific Language Impairment...rather than a primary reading disability...Thus, Hyperlexia would be best conceptualized as a subgroup or variant of Specific Language Impairment (SLI), rather than as a variant of the language disorder subtype of developmental dyslexia."

The Hyperlexia: Therapy that Works manual also notes that hyperlexia "exists on a continuum" with autism, language disorders, and nonverbal learning disabilities.

In ADHD, for example, even "the subgroup that presented with [a hyperlexic-like reading style] was furthermore found to have elevated levels of autistic features." (Asberg Johnels et al., 2019).

There are also traits that can overlap with giftedness, which we'll touch on later. And, on the flip side, hyperlexia has even been identified alongside intellectual disabilities (although historical accounts use the r-word and other dated terms instead) so there can also be overlap with that as well. It's also what gave rise to the idea of considering hyperlexia as a splinter skill, which we'll also touch on later.

To summarize these overlaps, hyperlexia might get hidden behind other diagnostic labels, such as:

• Autism: Where reading and letter play is viewed as "obsessive" or restricted interests are dismissed as an autistic splinter skill, rather than a tool to support learning.

• Speech Language Impairment: Where the focus is only on the language deficits or delays, ignoring how reading can be used to bridge understanding and develop language.

• Giftedness: Where the focus is on how advanced the child is, missing the underlying comprehension challenges that appear later.

• Intellectual disability: Where the focus is on how surprising their reading is, treating it as some meaningless isolated skill rather than a specific learning profile.

It's important to note that I'm not saying it's an either/or kind of situation here (more on that later). Remember, hyperlexia is a practical label that gets identified alongside something else. It's just that sometimes professionals, educators, and even parents might focus too much on one area instead of taking a more holistic approach and considering the child as a whole.

4. Lack of a Standardized Definition & Diagnostic Criteria

Another challenge is the lack of a standardized definition for hyperlexia and the fact that there's no standardized diagnostic criteria either. These ambiguities have plagued the hyperlexia research for decades. As Macdonald et al. (2021) has pointed out, "currently, no consensual criteria are available to define hyperlexia across studies."

For example, Zhang & Joshi (2019) highlighted that the following aspects of hyperlexia are often unclear:

• Population criteria (e.g., typically vs. atypically developing children)

• What counts as "good decoding" and how it's defined

• How reading theories apply to hyperlexia

Sure, there's agreement over some of the key traits of hyperlexia. For instance, "an intense and precocious interest in written material, together with a discrepancy between decoding and reading comprehension skills are defining criteria for hyperlexia." (Ostrolenk et al., 2024)

But..."even the professionals themselves are not certain if hyperlexia is a disorder of language development or a disability of social imperception or both" (Chia et al., 2009) or if it's something that's specific to autistic populations (Newman et al., 2007).

The proposal of some hyperlexia subtypes, in particular Treffert's 3 subtypes, have further complicated things. While his subtypes are popular online and among some parents, his "classification of hyperlexia into three types has not gained consensus" (Mammarella et al., 2022) among experts. Type 1 is particularly problematic. Even Treffert (2011) himself writes that he shares "the hesitation to label what I refer to as hyperlexia I as 'hyperlexia' at all."

As Hopper (2003) notes, "The inclusion of precocious reading in otherwise normal children as a form of hyperlexia seems unnecessary and may detract from those children who are hyperlexic and need educational and other support."

Furthermore, Ostrolenk et al. (2017) noted that Treffert's "Hyperlexia type 1...do not qualify as hyperlexic...and are called precocious readers in most articles." They added that this subtype should not be included because "hyperlexia is defined by a very specific pattern of compulsive interest and exceptional skills, and we would like to 'preserve the concept of hyperlexia' for this unique profile."

Regardless, the lack of a standard definition and criteria really impacts proper identification.

5. It's Often Dismissed as a Splinter Skill or Viewed as Unimportant

Let's return to the discussion of splinter skills that I introduced earlier...

Too often, hyperlexia is brushed off as unimportant. It's dismissed as some meaningless splinter skill.

For instance, Paynter et al. (2016) discussed how "children's reading aptitude may be dismissed as a 'splinter skill' that serves no real purpose."

As Treffert (2011) has written, hyperlexia "has been too often mistakenly identified as being a 'splinter skill' in children with autism, which in most instances it is not." (Gee, I wonder why that's happening so often when one of your proposed subtypes literally describes hyperlexia "as a splinter skill as part of an autistic spectrum disorder"...but I digress.)

So while "the term 'splinter skill' does not mean such an ability, such as hyperlexia, is unimportant or can be disregarded," (Treffert Center's Hyperlexia Manual), that's unfortunately what's happening to families worldwide while seeking support for their hyperlexic child.

But hyperlexia isn't some isolated skill or ability.

Instead, it is a "key element of the child's learning style" and should be "used to develop language, to modify behavior, and to help the individual make sense of the world." (Kupperman's presentation, 2018; Hyperlexia: Therapy that Works manual)

Whenever hyperlexia is dismissed as a splinter skill, it can lead to professionals or educators actively discouraging the child from reading or limiting access to letter play to force social interaction (Newman et al., 2007). Both of which can be detrimental to hyperlexic development.

On top of that, these hyperlexic children might also be put into programs they don't need or simply don't fit their needs. For instance, a parent shared how their hyperlexic child was placed into a specific reading program that was designed for dyslexic students and "was teaching the very skills this child had already mastered," (Newman et al., 2007) while completely missing areas they actually needed support with.

Unfortunately, hyperlexia continues to be frequently dismissed as a splinter skill and likely will for quite some time, especially while Treffert's subtypes remain popular, even despite the lack of evidence/research and consensus among experts.

6. Advanced Decoding Can Mask the Struggles

Another reason why hyperlexia often gets overlooked or misidentified is because the advanced decoding skills can mask underlying challenges, such as comprehension.

Because of this strength, I'll frequently see questions like this pop-up: "They're reading so how's that a problem?" And it's why I continue to see comments like, "Hyperlexia just means early reading." (Don't get me started on that!)

Here's the thing though...The "children who present with hyperlexia may be assumed to have adequate reading comprehension skills, and thus be overlooked for more in-depth assessment." (Paynter, 2016) In fact, "many argue that hyperlexia in young children is a red flag for future reading comprehension difficulties rather than a sign of advanced reading proficiency." (Robertson, 2019)

Keebler Dresner (2024) pointed out how these advanced decoding skills in hyperlexia cause hyperlexia to be missed by teachers and for reading comprehension difficulties to be overlooked, even though they've been "there all along - hiding in plain sight," as Robertson (2019) likes to say.

As a result, identifying hyperlexia "often does not occur until early adolescence when...the deficit becomes a more challenging task." (Robertson, 2019)

7. The Giftedness Bias (& its Flipside)

Sometimes hyperlexia gets overlooked or missed entirely because of the giftedness bias, which is tied to the above point about advanced decoding skills.

But hyperlexia doesn't necessarily equal giftedness.

Too often, they are "erroneously assumed to be gifted," (Worthy & Invernizzi, 1995) but "it may not be appropriate to label hyperlexics as 'gifted children'" because IQ scores in hyperlexia can vary widely. (Zhang & Joshi, 2019)

Now, I'm not saying that hyperlexic kids can't be gifted. Some absolutely are, but not all hyperlexic kids will be classified as gifted. We can't just take the presence of hyperlexia "as 'proof' of precocity or giftedness." (David, 2024)

The thing is, many hyperlexic kids "hide behind the 'gifted abilities' that hyperlexia has to offer" (Rigg's 2012 presentation) and their challenges can be "hiding in plain sight but overlooked by parents and educators who may have been blinded by the students' early reading strengths." (Robertson, 2019) This can mean "little attention is paid to the language difficulties of hyperlexia, or to the very nature of the hyperlexic learning style." (Miller 1999 as quoted in Murdick et al., 2004)

Overlooking these difficulties isn't the only challenge here though. Barby et al. (2023) mentioned that parents and educators might also underestimate other difficulties or challenges the child might be facing.

So, instead of taking a holistic approach, there's too much focus on the gifted abilities, leaving you with an incomplete profile of the child's abilities as a whole.

There's also the flipside to consider. Sometimes there's so much focus on the deficits or what the child can't do that the strengths get ignored completely. For instance, Kupperman et al. (1998) pointed out that hyperlexia is "frequently disregarded as unimportant" because their "comprehension lagged behind."

The problem with focusing only on these deficits is that the most powerful tool for supporting their learning and development (i.e., their ability to decode written language) is often ignored.

Either way, hyperlexia very often gets overlooked because there's simply too much focus on the strengths or too much focus on their weaknesses. But, we need to recognize and understand both in order to "help them to maximize their potential." (Murdick et al., 2004)

8. Gestalt Language Processing Gets Mistaken for Advanced Verbal Fluency

When your hyperlexic child is also a gestalt language processor, they can often recite entire pages of a book or long movie scripts.

Sometimes this scripting can be mistaken for advanced verbal fluency, which can then mask their struggles or challenges. It's similar to how advanced decoding and the giftedness bias can lead to people missing underlying challenges.

Keebler Dresner (2024) noted how "these advanced fluency skills mask comprehension problems."

As Charlotte Miller (1999, as quoted in Murdick et al., 2004) also highlighted, hyperlexic children "may often be highly verbal and obviously academically gifted. These gifts at times may be so obvious that little attention is paid to the language difficulties of hyperlexia, or to the very nature of the hyperlexic learning style. Only through an understanding of these language difficulties, and the visual and gestalt processing style of these children, can we help them to maximize their potential."

It's these characteristics, the authors noted, that may lead to misidentification of hyperlexia. Or, as the quote mentions, they miss the "very nature of the hyperlexic learning style."

9. The "Wait & See" Approach

Sometimes parents and professionals might take a wait and see approach for a variety of reasons, which can delay proper identification and diagnosis.

Taking a "wait and see" approach is often based on "the assumption...that these children would eventually comprehend the meaning in the same way they easily figured out how to read the print," but "such an assumption ignores the basis that word recognition is a decoding process which those with hyperlexia are very good at, while comprehension is a much more complex process requiring organizational skills that are absent in hyperlexia." (Ng, 2013)

Recent research emphasizes that "there is a lack of evidence to support postponing reading comprehension therapy" and that early intervention "at the first signs of hyperlexia" is "highly advantageous for both reading and oral language development." (Macdonald, 2020)

So sometimes hyperlexia simply gets missed because parents never seek out diagnosis or intervention. And sometimes it's because parents are told to wait by doctors and pediatricians, reassuring them that their child would eventually catch up, their child is still very young, and/or that all children grow at different rates.

Either way, hyperlexia often gets overlooked when taking this "wait and see" approach.

10. Co-Occurrence Leads to Misdiagnosis (The "And" Not "Or")

Sometimes hyperlexia simply gets missed because it's seen as an either/or kind of situation. But hyperlexia is an "AND" not an "OR." In other words, hyperlexia co-occurs with something else, but can often end up being replaced by whatever that other label might be.

For example, hyperlexia might get identified simply as autism instead of hyperlexia and autism.

And sure some people might wonder why we should even bother identifying hyperlexia if it isn't a formal diagnostic label. Well, "the most important reason is that these children learn primarily through reading, so the therapeutic and educational programs that we devise for them must take their reading skills into account." (Hyperlexia: Therapy that Works manual)

The point here, though, is that when hyperlexia is treated as some either/or situation, there might be too much focus on whatever their co-occurring label is that you end up missing an important part of how they learn and how their brain works.

Some Final Thoughts on Why Hyperlexia is Often Missed or "Misdiagnosed"

As you can see, there are plenty of factors at play when it comes to identifying hyperlexia. So it's really not that surprising that hyperlexia gets missed, dismissed, or even misdiagnosed once you have a deeper understanding of these factors.

Consider the results of a small survey of parents and professionals from Chia et al. (2009):

• 47% saw hyperlexia as "an autistic symptom"

• 21% "thought it was related to dyslexia"

• 32% had never heard of the term before

Their findings illustrates some of the systemic barriers that face many parents of hyperlexic kids today, from the lack of awareness and information regarding hyperlexia to the confusion about the criteria and definition.

Unfortunately, parents not only have to face these barriers, but they're often the ones having to educate and teach others about what hyperlexia is, even after their child is successfully identified. For example, there was the psychologist during my son's autism assessment who introduced us to the terms hyperlexia and hypernumeracy, but not one teacher or resource teacher we've encountered personally over the course of my son's education has heard of either term before. I've had to introduce and explain hyperlexia every single time. Thankfully, it's a topic I don't mind talking about. (gestures around) Clearly...

So, until the diagnostic manuals, research, and training programs catch up, you will likely continue to be the person to educate others about hyperlexia.

Sure it might be exhausting work to be the educator, advocate, and parent, but understanding how your child's brain works and being able to confidently advocate that to others is definitely worth the effort.

When Do Hyperlexic Traits Typically Appear?

Answering a common question about hyperlexia: when do hyperlexic traits typically appear?

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Whenever people learn of the term hyperlexia and what it means, they'll follow it up with more specific questions about what it might look like or when it might appear.

One such question I see a lot is, "When do hyperlexic traits typically appear?"

It's a really great question, especially for those who might not be in the thick of things as parents raising hyperlexic children. Or it might be a question one asks when trying to determine whether or not they fit the description of hyperlexia themselves. It might even come up when trying to determine what's considered "early" when it comes to early reading.

It's also important to clarify that whenever people ask this question, the traits they're likely referring to are the more external and visible traits. Specifically, the early self-taught reading ability and the intense interest in letters. After all, it's these traits that usually catch parents off guard.

So let's take a closer look at this question, turning not only to the research and what the experts have to say, but with examples from my own experience with my son as well.

When Do Hyperlexic Traits Typically Appear?

Hyperlexic traits appear "as early as age 2, but usually by age 5." (Needleman 1982 as quoted in Grigorenko et al., 2002) A systematic review of the hyperlexia literature confirms this, showing that "the age of onset of hyperlexia...was consistently before the age of five years...and often much younger." (Ostrolenk et al., 2017)

But what does this look like exactly? What traits appear and when?

Well, it first begins with naming and identifying letters, usually between 18 and 24 months of age (Kupperman, 1997; 1998). It's this "intense or exclusive interest in letters" that is "the first sign of hyperlexia" most parents notice. (Ostrolenk et al., 2025)

From there, these children start to read.

This "reading develops independently," is self-taught, appears "spontaneously," and often appears "before they have really learned to talk." (Healy et al., 1982; Kupperman, 1997; Kupperman, 1998; Robertson, 2019). So it's not unusual for parents to note that their 2 or 3 year old can read, but can't carry on a conversation or express their wants and needs. These children might even be minimally-speaking or non-speaking (more on that here and here).

The research notes that "first word reading is observed between 2 1/2 and 3 1/2 years of age with 'striking uniformity," but it can develop even earlier than that. (Aram & Healy, 1988 as quoted in Mottron et al., 2013)

For instance, there have been case reports of this precocious reading ability appearing as early as 12 months, 15 months, 17 months, or 18 months of age (Mottron et al., 2013; Ostrolenk et al., 2017; Robertson, 2019), which, as Ostronlenk et al. (2017) pointed out is "about 18 months earlier than the earliest reported precocious reading case in typical children." (By the way, this observation is just one of many ways to distinguish a hyperlexic reader from other early readers. More on that here.)

It's important to note, though, that when we're talking about this early reading ability, we're talking about decoding. That is the strength of hyperlexia. There will also be lots of variability in reading abilities amongst hyperlexic children. If you're curious about what counts as reading in hyperlexia, I recommend reading this.

Now, obviously, these aren't the only hyperlexia related traits that will be observed during this timeframe. For example, you might notice traits such as echolalia, social differences, air writing, strong memory skills, sensory differences, and/or other language differences. But, for the purpose of this article, we're focusing on the hallmark early traits of hyperlexia, specifically the letter fascination and the precocious reading skills.

Our Personal Experience with Hyperlexia Before Age 5

For my son, he started to identify and name letters and numbers around 18-19 months of age. He loved to sing the ABCs on repeat and also really enjoyed license plates around this time.

Just before his second birthday, he spontaneously started to read and spell words. The first word he ever spelled out (that I can remember) was his name using wooden alphabet blocks. While I can't remember what some of the first words he read were at this age, I do remember that he read an entire book on his own around age 2 1/2.

From there, the bulk of his play was letter focused. He'd spend hours arranging letters, spelling words, turning other objects into letters, and so on.

My son also taught himself to write early. For instance, he wrote his name for the first time in chalk just past his third birthday.

Looking back, there were some other more subtle signs that I noticed before he started identifying letters or reading. These moments stood out as quite curious to me at the time, but I didn't know what they could possibly mean (mostly because I didn't know what hyperlexia was at that time!). For instance, I have a photo of my son at 4 1/2 months of age, sitting upright, with his hands clasped, staring intently at a board book. Then there's another photo of him at age 11 months carefully flipping through the pages, one-by-one, of a Harry Potter novel. He was so gentle with the pages, unlike anything I'd ever witnessed with a baby.

Of course, we also noticed a variety of other signs during this time like sensory, social, and language differences.

Further Reading on the Development of Early Traits of Hyperlexia

Now that you have an idea of when hyperlexia traits begin to emerge, you might be curious what to look for, besides the early reading ability. I highly recommend reading through the following resources to learn more:

• Signs of Hyperlexia in Toddlers & Babies - 12+ signs you might notice early on.

• What is a Spiky Profile? - Understand why hyperlexic kids are often advanced in some areas while struggling in other areas.

• Important Hyperlexia Milestones - Briefly covers developmental milestones in the early years (i.e., before age 5) and what to expect after that age.

• Gestalt Learning in Hyperlexia - Learn about the unique way hyperlexic children process information and language.

The above resources should give you a deeper understanding of those early hyperlexia traits that we see between ages two and five, a timeframe that is well documented in the research.

Hyperlexia & ADHD: What You Need to Know About Their Co-Occurrence

A look at hyperlexia and ADHD, its co-occurrence, and what the research says.

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It's well known that hyperlexia is most often identified alongside autism (see here and here, for instance), but what about ADHD? Can it be identified alongside ADHD instead?

Well, we're going to take a look at the relationship between hyperlexia and ADHD, explore its co-occurrence, and take a peek at what the research says.

Can Hyperlexia be Identified Alongside ADHD?

While "autism is most frequently associated with hyperlexia" (again, more on that here and here), "other conditions have also been identified, including ADHD." (Schenker, 2025)

So, yes, hyperlexia can be identified alongside ADHD.

After all, hyperlexia "does not usually occur on its own, but rather" alongside a variety of developmental conditions "including autism, pervasive developmental disorders, attention-deficit-hyperactivity disorder, and learning disabilities." (Aram & Healy, 1988 as quoted in Lester, 2003).

It's worth noting, though, that "while hyperlexia has also been found to occur with ADHD (e.g., Asberg Johnels et al., 2019), and dyslexia sometimes co-occurs with autism, it appears to be much more common for hyperlexia to co-occur with autism and dyslexia to co-occur with ADHD." (Schenker, 2025).

In other words, it's pretty uncommon for it to be hyperlexia with ADHD and much more likely to be hyperlexia with autism (whereas dyslexia is usually identified alongside ADHD versus autism). Again, this statement shouldn't be surprising given the strong link between hyperlexia and autism that I touched on earlier and elsewhere.

One little caveat to keep in mind, however, is that it might not be just ADHD alone, as you will see. (By the way, my son was initially identified with hyperlexia, hypernumeracy, and autism, but ADHD was added a couple of years later as well.)

As we will explore in the next section, even for those with hyperlexia and ADHD, a lot of autistic features will still be present as well. So it's possible they might still be autistic. It's just they don't currently meet the threshold for a formal clinical diagnosis of autism.

Hyperlexia & ADHD: What the Research Says

First things first, there's not a ton of research on hyperlexia and ADHD, which isn't surprising given how little research on hyperlexia exists to begin with. However, there have been a few mentions of ADHD sprinkled in here and there in the hyperlexia literature.

For instance, there was some research conducted in the 1980s with 12 hyperlexic children that mentions possible ADHD. They noted that, "several [of these children] also were diagnosed as having attentional deficits and/or psychosocial problems, including autism." (Aram, 1997) However, it's unclear how many of these "several" children showed these attentional deficits. It's also unclear whether or not they would be formally diagnosed with ADHD and/or would be identified with both ADHD and autism (i.e., they're AuDHD).

It's also interesting to point out that while these "attentional problems" were present, the "attentional problems...were less apparent than with other tasks" such as when they were engaged in reading tasks. (Healy et al., 1982) So, if reading was involved, they were highly engaged, but if reading wasn't involved, they were highly distractible.

In a research study with 10 hyperlexic children, Richman and Kitchell (1981) noted that two of their participants "were on medication for hyperactivity." Interestingly, one child in their study had their "referral symptoms" (their words, not mine) listed as "hyperactivity/autistic-like," which we'll come back to in a bit.

There's also a case study a few years later of a hyperlexic boy whose "primary diagnosis is attention-deficit disorder." (Healy & Aram, 1986)

Beyond that, though, there's not much on hyperlexia and ADHD until much more recently when Asberg Johnels et al. (2019) looked at a hyperlexic-like reading style (HPL) in ADHD, specifically in Swedish-speaking girls, ages 8 to 17. Here's what they discovered:

• In the autism group, 42% showed HPL.

• In the ADHD group, 28% met the researcher's criteria for HPL.

• In the comparison group, 13% showed HPL.

They pointed out that, "A hyperlexic-like style of reading (HPL), defined as word decoding substantially better than reading comprehension, was found in an important minority of female school-age children with a diagnosis of ADHD. The subgroup that presented with HPL was furthermore found to have elevated levels of autistic features." (Asberg Johnels et al., 2019) This subgroup "showed poorer social interaction skills and more communication errors than the ADHD participants without hyperlexia, and these deficits are also characteristics of ASD." (Zhang & Joshi, 2019).

In other words, "adolescent girls with both hyperlexia and ADHD present with more autistic characteristics than peers without hyperlexia," (Schenker, 2025) suggesting that looking only at the hyperlexic or ADHD label might mean missing the specific autistic-style processing that they use.

Or more simply, ADHD will rarely be paired alone with hyperlexia. There will often be high levels of autistic-like traits present as well.

For instance, Keebler Dresner (2024) noted that "hyperlexia is comorbid with attention deficit disorders (ADHD) and distractibility; these conditions are extremely common in students with autism who have trouble filtering out environmental noise."

Asberg Johnels et al. (2019) also emphasized that they "preferred to use the term 'a hyperlexic-like reading style' to describe the patterns of reading displayed by the ADHD + HPL group. Still it could be questioned whether 'hyperlexic' is the best word to use at all." They added that they "prefer to use the term 'hyperlexia-like reading style' (HPL) rather than 'hyperlexia' in our study to signal that this is a descriptive label rather than a formal medical diagnosis with clearly agreed criteria."

The use of this terminology is very telling and important to highlight because it shows that they were hesitant to call it full blown hyperlexia in this female ADHD population.

This recent research, paired with earlier case studies of hyperactivity and autistic-like children (e.g., Richman & Kitchell, 1981) suggest that hyperlexia will rarely be paired with ADHD alone. Instead, there will be "an overlap in expression" where hyperlexia "would be associated with elevated levels of autistic symptomatology (i.e., social, communicative, and/or restricted and repetitive behaviors)." (Asberg Johnels et al., 2019).

More simply, if a child has ADHD and hyperlexia, they'll likely present with lots of autistic traits, even if they aren't formally identified with autism yet.

One final takeaway from Asberg Johnels et al.'s research is that "readers with ADHD + HPL need to be supported in 'reading for meaning,' rather than just decoding the words," underscoring the importance of prioritizing comprehension in hyperlexia (something you'll hear me say a lot around here).

A Quick Summary of ADHD & Hyperlexia

Now, I know that was a lot of information to get through so let's do a quick recap of everything we discussed:

• Hyperlexia can be identified alongside ADHD, but it is rarely paired with ADHD in isolation.

• There are a few mentions of hyperlexia co-occurring with ADHD in the research.

• According to one study, the prevalence of hyperlexia in girls with ADHD (28%) is much lower than in autism (42%). It's also often described as hyperlexic-like versus true hyperlexia and these hyperlexic ADHDers still present with significantly more autistic features than their ADHD peers who have typical reading styles.

• In ADHD, a hyperlexic-like reading style acts as a clinical marker for underlying autistic traits. This means that children with this profile often show higher levels of autistic traits, even if they don't meet the criteria for a formal autism diagnosis yet.

• It's important to support comprehension in readers with ADHD and hyperlexia, as it is with all hyperlexic learners.

Hopefully, this information and research helps to answer your questions about the co-occurrence of hyperlexia and ADHD.

Does Hyperlexia Disappear?

Answering a common question about hyperlexia: does hyperlexia disappear? Is it something you grow out of?

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Quite frequently, I'll see people say things like "I was a hyperlexic child" or "my child was hyperlexic." They say it in past tense, as if hyperlexia was something they once had and have since outgrown.

But that's not how hyperlexia works at all.

Unfortunately, when people make statements like this, they're inadvertently perpetuating some myths and spreading misinformation about what hyperlexia truly is. They end up framing hyperlexia as something that only occurs in childhood and then somehow disappears.

But, does hyperlexia disappear? Is it something you outgrow?

Well, considering the fact that hyperlexic adults do exist, you likely already have an idea of what the answer is going to be here...

But it's also important to dig into why this question comes up so frequently and why people think hyperlexia might disappear with age.

So...Does Hyperlexia Disappear?

No, hyperlexia does not disappear. It is a neurodivergent profile and a specific learning style. Therefore, it's a fundamental part of how a person's brain is wired. So, once hyperlexic, always hyperlexic.

That means a hyperlexic child grows up to become a hyperlexic adult.

As pointed out in the Hyperlexia: Therapy that Works manual, "the characteristic learning style [of hyperlexia] remains through adulthood." Recent research (see Schenker, 2025) even found that the "hyperlexic reading profile is detectable in adults."

However, it is worth noting that the way hyperlexia looks or presents can change significantly as a person grows and some of these changes can explain why some people mistakenly think that hyperlexia disappears with age.

Why Some People Think that Hyperlexia Disappears

This misconception that hyperlexia goes away with age can come down to a few things.

1. Hyperlexia is rarely discussed beyond the childhood years

First things first, people rarely discuss hyperlexia beyond the childhood years, making it seem like it's a childhood-specific phenomenon.

So, while research on hyperlexia has been around for 50+ years, research has focused almost exclusively on hyperlexia in childhood. It's only recently that hyperlexia in adulthood has even been discussed in the research (e.g., Schenker, 2025).

2. Hyperlexic kids tend to lose their interest in reading as they age

Another thing to consider is that many hyperlexic children end up disliking reading as they age. Something that I've talked about before here.

Too often, people assume that hyperlexic kids are major bookworms as they grow up, but that's simply not the reality for most. Even research has noted that "growing up, a number of children with hyperlexia appear to be losing their passion for reading" (Grigorenko et al., 2003).

So, "hyperlexic children may not remain voracious readers over time" (Sparks & Artzer, 2000) with the "compulsive nature of their reading" abilities diminishing as they "developed other interests" (Hopper, 2003).

This loss of interest might get misinterpreted as outgrowing hyperlexia. However, this loss of interest is actually tied to a plateau effect that often occurs around fourth grade (Hopper, 2003). And, if you've followed me from some time, you know I've talked about this fourth grade marker before!

3. The fourth grade plateau

If you read through the hyperlexia research, you'll see mentions of the fourth grade come up time and time again. That's because fourth grade marks the shift from "learning to read" to "reading to learn." In other words, the focus of reading in fourth grade shifts from learning how to read (i.e., decoding) to reading for meaning and understanding (i.e., comprehension).

As Robertson (2019) has pointed out, "fourth grade also often marks the downward spiral point for students with hyperlexia, many of whom, once considered advanced readers, suddenly appear to develop a reading disability." While downward spiral might be a bit of an extreme statement, the point still stands that fourth grade is a turning point for hyperlexic readers because "eventually their classmates catch up in reading skills." (Ng, 2013)

That's because the "exceptional skill in single-word recognition...evens off by age 10 to an average ability level, perhaps as other children 'catch up'" (Newman et al., 2007). Macdonald (2020) also noted that "their advanced word reading appears to decline with increasing age to the point where it reaches the normative average at around age 10 years."

In other words, at around age 10, hyperlexic readers "do not read better or more than their peers" and their reading skills "appear to normalize as children on the expected trajectory...catch up," which matches findings from earlier research from Goldberg (1987).

Sparks and Artzer (2000) also found similar results, in that, for hyperlexic kids, the ability to recognize words "was superior to [typically developing] readers when both groups were younger, but that the [typically developing] readers 'caught up' in [this] skill over time." As Heaton and Wallace (2004) pointed out, "this decoding skill eventually ceases to be outstanding because there is a ceiling on ability."

So, when someone assumes that "hyperlexia can be dismissed as a passing phase in childhood [they] do not realize that they are far from being correct." (Ng, 2013) Sure their peers eventually catch up around age 10, but that doesn't change the fact that they are still hyperlexic and learn differently.

So What Does "Staying" Hyperlexic Look Like Then?

Well, as we touched on above, even though their peers eventually catch up and the interest in reading diminishes, that doesn't change their underlying brain wiring. That remains the same.

So they will still prioritize and process information visually and through a text-based lens because that's how their brain is wired.

Their hyperlexic brain wiring does not disappear simply because they turned 10...

Instead, we need to recognize and understand that being hyperlexic is about having a brain that is (and always will be!) deeply connected to the written word. And that might look like still needing subtitles and preferring written instructions, even as an adult. (Read more about what hyperlexia looks like in adulthood here.)

So, just to reiterate, hyperlexia is a lifelong neurotype and learning profile, not something that magically disappears after childhood.