Does dyslexia affect speaking?

Dyslexia mainly affects reading and spelling, but its roots lie in the sound structure of language, so it can show up in speaking too. The clearest effects are on word retrieval, which is getting the word you want out of memory, and on tasks that involve sounds in words, such as repeating an unfamiliar word. Most of the research on these effects uses group averages on specific tasks, so it cannot tell you how a particular person talks. For the wider picture, see our guide to speech to text for dyslexia and dysgraphia, part of our accessibility and health guides.

Dyslexia is a language-based difficulty with sounds at its core

Developmental dyslexia is a specific learning disorder concerning reading acquisition, and it can have a lifelong negative impact on the people who have it ¹. A 2018 review in the ASHA journal for schools goes further and treats dyslexia as a language-based disorder. Its definition is a difficulty with word-level reading and spelling skills, which it says are in turn caused by phonological deficits ².

Phonological means relating to the sound structure of words. If the sound system is less precise, reading and spelling suffer, and so can speech, which relies on the same sound system. That is why the link to speaking is worth understanding, even though reading is the central problem.

Speaking can show the difficulty through word retrieval and sound tasks

The same review summarizes the evidence this way: there is now an abundance of evidence that children with dyslexia, on average, perform poorly on tasks that involve phonology, including phoneme awareness, word and nonword repetition, and word retrieval ³.

In practice, word retrieval looks like a pause before a word, a substitution of a similar-sounding word, or a vague word such as "thing" in place of the one you want. Repeating an unfamiliar name or a long technical word can also be harder. These are group averages, and the same pauses happen for many reasons, so they are not a test for dyslexia. A speech-language assessment can measure them directly and show whether they are a real pattern.

Two points keep the picture accurate:

• The evidence describes averages on specific tasks. It does not describe everyday talking, and the research summarized here does not measure fluency in conversation.
• Speaking differences are not the core of dyslexia. The defining problem is reading and spelling at the word level. If you are unsure whether speech is involved, look at the reading and spelling profile first.

Can speech therapy help with dyslexia?

Speech therapy can target the sound skills that dyslexia affects, but the best-controlled evidence is for a specific kind of reading instruction. A 2014 meta-analysis pooled randomized controlled trials of reading treatments for children and adolescents with reading disabilities, and it included 49 comparisons of experimental and control groups ⁴. Phonics instruction was the most studied approach, and it was the only approach whose efficacy on reading and spelling was statistically confirmed ⁵.

Those results do not test speech therapy as a service. In the sources we checked, we did not find a controlled trial of speech therapy for dyslexia as a separate program. So the honest answer is that speech-language work can target the phonological skills that dyslexia affects, and the reading gains with confirmed evidence come from phonics instruction. Ask a speech-language pathologist which skills they will train, how they will measure progress, and whether the work is linked to reading instruction.

What to do if you notice speaking difficulties

1. Test reading and spelling as well as speech. A speech screen alone will not show whether reading is affected, and a reading test alone will not show word retrieval.
2. Ask for a speech-language assessment if word-finding or repetition is a concern. Ask whether the assessment covers phonological skills, not only articulation.
3. Ask what will change in reading. A good plan connects sound work to reading and spelling instruction, and it measures both.
4. Use the tools you have while you wait. Dictation lets you compose without searching for the spelling of each word, and read-back helps you catch the words you meant to say. The question on speech to text versus text to speech explains how to choose between them.

If writing is the main difficulty, the question on dysgraphia and dyslexia explains how the two differ. For a related question, see does touch typing help dyslexia, which covers the same distinction between skill and underlying difficulty.