Common Dyslexia Spelling Mistakes: Causes and What Helps

Dyslexia writing is hard for reasons that have nothing to do with effort or intelligence. The difficulty sits in how the brain processes phonology (the sounds within words), working memory (holding information in mind while using it), and sequencing — not in understanding or forming ideas. The British Dyslexia Association describes dyslexia as primarily affecting accurate and fluent word reading and spelling, with phonological processing, verbal memory and processing speed commonly affected alongside it.

Common dyslexia spelling mistakes at a glance

Most dyslexic spelling errors don't look like typos — they're real, correctly-spelled words used in the wrong place, or non-words close enough to several real words that spellcheck guesses wrong. That's why a document can sail through spellcheck with no red underlines and still contain several genuine mistakes:

Homophones

Words that sound identical but mean different things — their/there/they're, your/you're, its/it's, to/too/two, then/than, were/we're — are spelled correctly as words, just the wrong one for the context. Since each is a real, correctly-spelled word, generic spellcheck has nothing to flag. This is one of the single most common dyslexic writing errors and one of the easiest for a human proofreader — or a tool built to check word-in-context, not just word-in-dictionary — to catch.

Phonetic spelling

Writing a word the way it sounds rather than how it's conventionally spelled — 'thort' for 'thought', 'nite' for 'night' — is common with dyslexia because English spelling is often inconsistent with pronunciation. Basic spellcheck usually catches these since they're visually distant from the correct spelling, but it can suggest the wrong correction if several real words are a similar edit-distance away, so it's still worth a second look rather than trusting the first suggestion.

Letter reversals and transpositions

Reversing similar-looking letters (b/d, p/q) or swapping the order of letters within a word produces two different kinds of mistake. Some swaps land on a different real word — 'form' instead of 'from', 'was' instead of 'saw' — which spellcheck has no reason to flag since the result is correctly spelled. Others produce a non-word, like 'becuase' for 'because' (the 'a' and 'u' swapped) — spellcheck does catch these, but can suggest the wrong fix. 'Recieve' for 'receive' is a similar adjacent-letter swap, and also the classic "i before e except after c" rule — it's not a phonetic error (the two spellings sound identical), it's a memorised convention that's easy to get backwards.

Missing or duplicated small words

Small function words — a, the, of, to, is — are easy to drop or double up while writing, especially in longer sentences where working memory is doing more of the load-bearing. Because the sentence often still parses without them, or reads slightly awkwardly rather than being obviously wrong, this is one of the errors reading text aloud catches far more reliably than reading it silently.

Why writing is hard with dyslexia

Spelling, working memory and letter formation are separate skills, and dyslexia can affect each one differently from person to person. Spelling difficulty often comes from weaker phonological processing — the link between a sound and the letters that represent it is less automatic, so spelling has to be worked out consciously rather than recalled instantly. Working memory difficulty shows up mid-sentence: holding a sentence's planned structure in mind while also spelling each word and tracking what's already been written takes more conscious effort, which is why sentences can run on, lose their thread, or drop a word partway through. None of this reflects how good the underlying idea is — it's a production bottleneck between the idea and the page.

Handwriting

Handwriting adds a layer that discussions of dyslexia and writing often skip: physically forming letters is a sequencing and motor-planning task in its own right, on top of spelling and sentence structure. For many dyslexic writers, handwriting is slower and more effortful than typing, because typing removes one layer of that sequencing — selecting a whole letter with one keystroke rather than planning and executing its shape by hand. That's a reasonable, common reason to prefer typing or voice dictation for anything beyond a quick note, and it's a legitimate adjustment to ask for at school or work rather than something to push through unaided.

Working memory and writing

Working memory is the mental workspace used to hold a sentence's structure, the word choices made so far, and where the sentence is going, all at once, while also handling spelling and phrasing. For a sentence of any length, that's a lot to hold simultaneously, and dyslexia often means less of that workspace is available for planning because more of it is taken up by decoding spelling as you go. In practice, this is why writing in shorter sentences, or dictating a rough version before editing, tends to work better than trying to build a long, complex sentence correctly in one pass — it reduces how much has to be held in mind at once.

Strategies for study

If dyslexia affects studying, a few adjustments consistently help more than trying to write under the same conditions as everyone else:

• Extra time in exams and coursework deadlines, arranged through your school, college or university's support services — this is a standard, recognised adjustment, not a special favour.
• Reading your own writing aloud, or using text-to-speech, instead of silently re-reading it — your eyes tend to skip errors your ears catch.
• Getting ideas down by talking them through or dictating a rough draft first, then editing as a separate pass, rather than trying to get spelling, structure and ideas right in one go.
• In UK higher education, the Disabled Students' Allowance (DSA) can fund specialist software, equipment and support — it's worth checking eligibility through your university's disability service even if you've never used formal support before.

Strategies for the workplace

The same difficulties show up at work — emails, reports, meeting notes — and employers in England, Scotland and Wales have a legal duty to help: under the Equality Act 2010, they must make reasonable adjustments for employees with a disability, which dyslexia can qualify as. (Northern Ireland has its own, broadly similar disability discrimination law rather than the Equality Act 2010.) In practice that can mean extra time on written tasks, permission to use assistive software, or written instructions instead of verbal-only ones.

Access to Work, a UK government grant, can fund assistive software and equipment directly for employed and self-employed adults — often at little or no cost to you or your employer. Asking HR or your manager directly, rather than working around the problem alone, is usually the more effective route.

Where a tool like DyslexiaWrite fits in

DyslexiaWrite is built around each of these specifically: phonetic and homophone-aware spelling correction instead of generic spellcheck, text-to-speech read-back with word-level highlighting for proofreading by ear, voice dictation so typing and spelling aren't blocking you from getting ideas down, and sentence rewriting that shortens and clarifies without changing your meaning. There's a free tier with no card required, and UK employees and the self-employed may be able to get it funded through Access to Work.

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