Is there a link between left-handedness and dyslexia? Research shows a small but real statistical association between non-right-handedness and dyslexia, driven primarily by shared patterns of atypical brain lateralization rather than a direct cause-and-effect relationship.
The association is modest — most left-handed people do not have dyslexia, and most people with dyslexia are right-handed. Understanding what the research actually shows helps parents and educators respond appropriately rather than drawing unwarranted conclusions from a child's hand preference.
What the research shows
The scientific literature on handedness and dyslexia is consistent in finding a small overrepresentation of non-right-handedness among people with dyslexia compared to the general population. The association is real, though its magnitude is modest.
A 2014 meta-analysis published in Psychological Bulletin, one of the most comprehensive reviews of the topic, analyzed data from multiple studies and found that individuals with dyslexia were statistically more likely to be left-handed or mixed-handed than the general population. The effect was stronger for mixed-handedness than for consistent left-handedness — a pattern that parallels findings in research on left-handedness and ADHD.
A large population-based study using data from the UK Biobank, involving over 300,000 participants, found a similar small but significant association between non-right-handedness and self-reported reading difficulties. As with the ADHD research, the effect sizes were small — handedness alone explained a tiny fraction of the variance in dyslexia prevalence.
Key findings from the research
- Non-right-handedness is slightly more common in people with dyslexia than in the general population
- The association is stronger for mixed-handedness than for consistent left-handedness
- The effect is small — handedness is not a reliable predictor of dyslexia at the individual level
- Most left-handed people do not have dyslexia
- Most people with dyslexia are right-handed
- The association appears in childhood and may be stronger in younger populations
The brain lateralization connection
The proposed mechanism connecting handedness and dyslexia centers on brain lateralization — the way the brain distributes different functions across its two hemispheres. In most right-handed people, language processing is strongly concentrated in the left hemisphere. This includes phonological processing: the ability to recognize, manipulate, and decode the sound structure of language, which is a core skill in learning to read.
Phonological processing difficulties are considered the primary cognitive signature of dyslexia. Children with dyslexia typically struggle to segment words into their component sounds, to link written letters to their phonological representations, and to hold phonological information in working memory long enough to decode unfamiliar words.
Research on the left-handed brain has consistently shown that left-handed and mixed-handed individuals are more likely to have atypical language lateralization — with language processing distributed more symmetrically across both hemispheres rather than being concentrated in the left. The theory is that this atypical lateralization may, in some cases, affect the efficiency of phonological processing networks that depend on highly lateralized left-hemisphere function.
This is a theoretical framework, not a proven causal chain. The pathway from atypical lateralization to phonological difficulty to reading challenges is plausible and has some empirical support, but it is not fully established, and it clearly does not apply to most left-handed people.
Mixed-handedness and dyslexia
An important distinction in the research — the same one that emerges in the handedness-ADHD literature — is between consistent left-handedness and mixed-handedness. Consistent left-handers use their left hand for virtually everything. Mixed-handed individuals alternate between hands depending on the task: writing with the left but throwing with the right, for example, or using scissors with either hand.
Studies consistently find that the association with dyslexia is stronger for mixed-handedness than for consistent left-handedness. This suggests that the relevant underlying factor may be the degree of hemispheric specialization rather than which hand a person prefers. Mixed-handedness may reflect a less lateralized brain organization, and it is this pattern that appears to be associated with the atypical phonological processing found in dyslexia.
Consistent left-handedness, by contrast, often involves strong left-hand dominance that parallels the strong right-hand dominance of right-handers — just in the opposite direction. The brains of consistent left-handers may be more lateralized than those of mixed-handers, which could explain the weaker statistical association with dyslexia.
Correlation is not causation
The research on handedness and dyslexia shows correlation, not causation. This matters practically.
- Being left-handed does not cause dyslexia. The two conditions share some underlying developmental influences, but left-handedness does not lead to reading difficulties.
- Being left-handed does not mean a child will have dyslexia. The statistical overlap is small and does not translate into meaningful individual prediction.
- Having dyslexia does not mean a person is left-handed. The majority of people with dyslexia are right-handed, consistent with the general population.
- Shared genetic factors may underlie both traits. Research into whether left-handedness is genetic has identified genes involved in the development of brain asymmetry. Some of these same genes may influence aspects of neurodevelopment relevant to reading, creating a statistical overlap without any direct causal relationship.
This pattern — where two traits appear to share developmental roots without one causing the other — is common in neuroscience. It explains the statistical association without implying that anything about being left-handed impairs reading ability.
What this means for parents
Left-handedness in a child is not a risk factor for dyslexia significant enough to warrant proactive screening. Here is a grounded perspective on what the research means in practical terms.
Do not use handedness as a screening criterion
A child's hand preference does not reliably predict reading difficulties. If your child is left-handed and learning to read without problems, there is no reason for concern based on handedness alone. Early reading development depends on phonological awareness, letter knowledge, vocabulary, and access to good instruction — not on which hand a child writes with.
Watch for reading difficulties independently
If your child shows signs of reading difficulty — struggling to connect sounds to letters, slow and effortful decoding, difficulty rhyming, or reading significantly below grade level — these should be evaluated on their own merits, regardless of handedness. Dyslexia screening and assessment is based on reading behavior and cognitive testing, not hand preference.
Do not try to change handedness
Nothing in the research supports the idea that making a left-handed child write with their right hand reduces dyslexia risk. Forced hand-switching has been linked to stuttering, emotional distress, and writing difficulties. If your child is naturally left-handed, supporting that hand preference is the right approach. Our guide on how to teach a left-handed child to write covers practical strategies for helping lefties develop good handwriting technique.
Focus on early literacy foundations
For any child — left-handed or right-handed — the best protection against reading difficulties is strong early literacy instruction: phonemic awareness activities, systematic phonics instruction, regular reading aloud, and a print-rich environment. If a left-handed child does develop reading difficulties, a comprehensive evaluation by an educational psychologist or reading specialist will identify the specific nature of those difficulties and guide appropriate support.
What this means for educators
Teachers and educators should be aware of the research context without drawing premature conclusions. A left-handed student struggling with reading should receive the same evaluation and support as any other student with reading difficulties — there is nothing about being left-handed that changes how dyslexia presents, how it is assessed, or how it is remediated.
Classroom accommodations for left-handed students — appropriate seating, left-handed writing tools, correct paper angle — are valuable regardless of whether reading difficulties are present. A left-handed child who is uncomfortable with their writing setup may appear to struggle with written work for reasons unrelated to any reading difficulty. Ensuring good physical conditions for left-handed writers is a basic form of inclusion, not a dyslexia intervention.
Left-handedness in the broader neurodevelopmental context
The handedness-dyslexia connection does not stand alone. Research has found small statistical associations between non-right-handedness and several neurodevelopmental conditions, including ADHD, autism spectrum disorder, and developmental coordination disorder. Taken together, these findings suggest that atypical brain lateralization — which underlies non-right-handedness — occurs alongside other atypical developmental patterns at slightly elevated rates.
This does not mean left-handedness is a disorder, a syndrome, or a warning sign. It means that the same prenatal and genetic processes that produce a left-handed brain occasionally co-occur with other developmental differences. In the vast majority of left-handed people, the result is simply a left-handed person with fully typical development across all other domains.
Understanding why people are left-handed involves understanding how the brain organizes itself during development — a process that is natural, variable, and rarely problematic.
Practical takeaways
- A small but real statistical association exists between non-right-handedness and dyslexia, driven by shared patterns of brain lateralization
- Mixed-handedness shows a stronger association with dyslexia than consistent left-handedness
- The relationship is correlational, not causal — left-handedness does not cause reading difficulties
- Most left-handed people read normally — the statistical overlap is small
- Dyslexia screening should be based on reading behavior and cognitive assessment, not hand preference
- Forced hand-switching has no benefit and carries real risks — do not attempt it
- Good early literacy instruction is protective for all children regardless of handedness
Frequently asked questions
Are left-handed children more likely to have dyslexia?
Very slightly, in a statistical sense. Research shows a small overrepresentation of non-right-handedness among people with dyslexia compared to the general population. However, the effect is modest — most left-handed children do not have dyslexia, and most children with dyslexia are right-handed. Left-handedness is not a meaningful predictor of dyslexia at the individual level and should not be used as a basis for concern or screening.
Why might left-handedness be associated with dyslexia?
The proposed explanation involves brain lateralization. In most people, language processing — including phonological processing, which underlies reading — is strongly concentrated in the left hemisphere. Left-handed and mixed-handed individuals are more likely to have atypical lateralization, with language functions distributed more symmetrically across both hemispheres. This atypical organization may occasionally affect phonological processing efficiency, which is the core cognitive skill implicated in dyslexia. Most left-handed people are not affected, but the pattern creates a small statistical association at the population level.
Should I have my left-handed child tested for dyslexia?
Only if they are showing signs of reading difficulty, such as struggling to connect letters with sounds, reading well below grade level, difficulty with rhyming, or avoiding reading. These signs warrant evaluation regardless of hand preference. Left-handedness alone is not a reason to seek testing. If you do have concerns about reading development, a reading specialist or educational psychologist can assess phonological awareness, decoding skills, and reading fluency to determine whether dyslexia or another reading difficulty is present.
Does dyslexia affect writing differently for left-handed children?
Dyslexia affects the phonological and orthographic processes underlying reading and spelling, not the physical act of writing. Left-handed children with dyslexia face the same phonological challenges as right-handed children with dyslexia. They may also face the additional physical challenges that left-handed writers commonly encounter — smudging, paper angle, letter formation — but these are separate issues. A left-handed child who struggles with both the physical mechanics of writing and the encoding of words should have both issues assessed and addressed independently.
Is there any connection between left-handedness and other learning differences?
Research has found small statistical associations between non-right-handedness and several neurodevelopmental conditions including ADHD, dyslexia, autism spectrum disorder, and developmental coordination disorder. These associations reflect shared patterns of atypical brain lateralization rather than any causal relationship. Left-handedness is one expression of how the brain organizes itself during development, and that same developmental variation occasionally co-occurs with other differences — though in most cases it does not. The neuroscience of the left-handed brain continues to be an active area of research that is refining our understanding of these relationships.
