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What Causes Dyslexia? Genes, the Brain, and the Part You Can Shape

What causes dyslexia? Genes, the brain and the world around a child, working together (IDA, 2025). Struggling to read says nothing about how smart your child is. Here is what to ask for, and what to do at home now.

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Learning Success infographic titled Empowering Children with Dyslexia: A Multi-System Approach. The first panel, Understanding the Causes: A Complex Multi-System Condition, shows three boxes: genetic factors, neurobiological differences (dyslexia is not a deficit of intelligence but a different way the brain processes information), and environmental influences. The middle panel, The Importance of Early Intervention, shows a critical development window box, a 1 in 5 children figure, and a dynamic growth potential box countering the myth that dyslexia is permanent. The last panel, Empowerment and Action Steps: Parent Takeaway, gives three steps: provide targeted accommodations, foster an inclusive environment, and the vital role of the parent as the child's primary advocate. The footer carries the Learning Success logo.
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Learning Success infographic titled Empowering Children with Dyslexia: A Multi-System Approach. The first panel, Understanding the Causes: A Complex Multi-System Condition, shows three boxes: genetic factors, neurobiological differences (dyslexia is not a deficit of intelligence but a different way the brain processes information), and environmental influences. The middle panel, The Importance of Early Intervention, shows a critical development window box, a 1 in 5 children figure, and a dynamic growth potential box countering the myth that dyslexia is permanent. The last panel, Empowerment and Action Steps: Parent Takeaway, gives three steps: provide targeted accommodations, foster an inclusive environment, and the vital role of the parent as the child's primary advocate. The footer carries the Learning Success logo.

Your child read a word on Monday. On Tuesday, they could not read the same word. Later, you lie awake and wonder what caused it, and whether you missed something. That worry is heavy, and you are far from the only parent carrying it. Your child isn’t broken. Their brain is learning differently.

Common questions from parents

Is dyslexia something I caused?
The IDA describes a mix of causes that work together over time: genes, brain differences and the world around a child. It names no single cause. To us, a parent asking this is a parent paying attention. What you do next matters more to us than where it came from.
Is dyslexia a sign that my child is not smart?
Struggling to read says nothing about how smart your child is. The IDA’s 2025 definition dropped the old line tying reading trouble to other abilities. Catts et al. (2026) say tests built on an IQ gap “lack predictive validity.” To us, a bright child who finds reading hard is no puzzle at all.
Will dyslexia go away if we wait?
Waiting has never taught a child to read. Teaching does. Ask for direct phonics teaching, with sounds and letters taught step by step. In 22 randomized trials, only phonics teaching showed a clear result (Galuschka et al., 2014). Start where your child is, whenever that is.
Should I use a dyslexia screener or ask for an evaluation?
A screener asks what you see at home. It does not diagnose, and it is a starting point. Might your child need an IEP or 504 plan? Then ask for a professional evaluation too. Do the same if you suspect a vision, hearing or medical cause. Only that evaluation can get those school supports. In the US, you can ask your child’s school for one. It is free to your family.
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Dyslexia has no single cause. Genes, the brain and the world around a child all play a part (IDA, 2025). It says nothing about how smart your child is.

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What causes dyslexia, according to this graphic?

The graphic says dyslexia has no single cause. It names three parts that work together.

  • Genes. Genes play a part. Some parents see their own school days in their child.
  • The brain. A child’s brain handles written words in its own way. The graphic says this is not about intelligence. We agree, and the next section says why.
  • The world around the child. The IDA’s word for this is environment. To us, that includes the teaching a child gets.

The International Dyslexia Association (IDA) put it this way in 2025: “The causes of dyslexia are complex and involve combinations of genetic, neurobiological, and environmental influences that interact throughout development.”

Two lines on the graphic go too far. First, it says dyslexia lasts no matter how good the teaching is. The IDA says something more careful. The trouble lasts “even with instruction that is effective for the individual’s peers.” So teaching that works for classmates is not enough. This child needs teaching that is more direct. Second, the graphic gives a figure for how common dyslexia is. Experts still argue about that number. It depends on where the line is drawn (Catts et al., 2026).

Your child isn’t broken. Their brain is learning differently.

Laura Lurns · Learning Success expert

Does dyslexia mean my child is not smart, or stuck for good?

Struggling to read says nothing about how smart your child is. The 2002 definition called reading trouble “often unexpected in relation to other cognitive abilities.” The 2025 definition dropped that line. Catts et al. (2026) explain why. Tests built on an IQ gap “lack predictive validity.” In plain words, the IQ gap was a poor guide.

Stuck for good is the other fear. A diagnosis describes where your child is today. It does not predict where they’ll be in a year of the right kind of practice.

Brain scans give a small, real hint for reading. Temple et al. (2003) scanned children before and after a reading program. Brain activity during reading moved toward the pattern of typical readers. A review of 39 such studies found they do not all agree (Perdue et al., 2022). So we keep this claim small. Practice changed how the brain worked while reading. That is what was measured.

Key takeaways

  1. A mix of causes: Genes, the brain and the world around a child work together (IDA, 2025).
  2. Not about smarts: Struggling to read says nothing about how smart your child is.
  3. Teaching builds reading: Direct, step-by-step phonics teaching builds the skill, whenever you start.

What can I do for my child right now?

The graphic ends with three steps for parents. Here they are, with one change.

  • Ask for direct phonics teaching. This means sounds and letters, taught step by step. Galuschka et al. (2014) looked at 22 randomized trials. Phonics teaching was the only approach that reached statistical significance.
  • Add supports that help today. Audiobooks and text-to-speech let your child reach the same stories as the class. They sit beside reading teaching, not in place of it. Here is how to tell a support from a skill builder.
  • Make home a safe place to read. Read aloud together every day, whatever your child’s level. Praise the effort, not the level. Say the word dyslexia out loud, without shame.

Here is the change. The graphic says to fit tools to your child’s “unique processing style.” Matching teaching to a learning style was tested and did not hold up (Pashler et al., 2008). Choose support by the skill your child has not built yet.

You are the one who sees the homework and the tears. You notice first. If the struggle keeps going, ask the school for an evaluation.

“Although identification and targeted instruction are important at any age, language and literacy support before and during the early years of education is particularly effective.” (International Dyslexia Association, 2025)

You saw it first. Trust that. Then ask for teaching that builds the skill, step by step.

Laura Lurns · Learning Success expert

Nobody will ever advocate for your child as hard as you will. The old advice is to wait and see. Waiting has never taught a child to read. Teaching does.

When reading is hard, we look at more than reading: the sounds, the page, holding words in mind. The free dyslexia screener asks about each one, so you know where to start.

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Why we use AI, plainly: it writes from a knowledge base our team maintains and audits. We work through it line by line and pull anything the evidence stops supporting. The roadmap you get on Tuesday reflects what we corrected on Monday, and a human still reads it before you do.

Your school district must evaluate your child free of charge if you ask in writing, whatever your income and whatever the outcome (US, 34 CFR 300.111 and 300.301(b)). That route takes time and answers a different question than you do. This one starts today, from what you already know.

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A screener is a starting point, not a diagnosis. If your child might need formal accommodations (an IEP or 504 plan), or you suspect a vision, hearing or medical cause, pursue a professional evaluation too. That is the only route to those supports.

References

  • International Dyslexia Association (2025). Definition of Dyslexia, adopted 22 October 2025. dyslexiaida.org/definition-of-dyslexia/
  • Catts, H. W., Haynes, C. W., & Joshi, R. M. (2026). Defining dyslexia: 2025 revision. Annals of Dyslexia.
  • Temple E, Deutsch GK, Poldrack RA, et al. (2003). Neural deficits in children with dyslexia ameliorated by behavioral remediation: Evidence from functional MRI. Proceedings of the National Academy of Sciences, 100(5), 2860-2865.
  • Perdue et al. (2022). Systematic review and meta-analysis of 39 reading-intervention brain imaging studies.
  • Galuschka K, Ise E, Krick K, Schulte-Körne G (2014). Effectiveness of treatment approaches for children and adolescents with reading disabilities: A meta-analysis of randomized controlled trials. PLoS ONE, 9(2), e89900.
  • Pashler et al. (2008). Learning styles review.
· Learning Success expert Writes about the learning brain for parents who want plain answers. Every article is grounded in current neuroscience and classroom practice.

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