Dyslexia: signs, diagnosis and support

Key points

• Dyslexia is a specific learning difficulty affecting reading and spelling. It is not a mental health condition, and does not affect intelligence [1].
• The British Dyslexia Association says ten per cent of the population are believed to be dyslexic [4].
• Signs differ by age, and many adults are identified late or never.
• Assessments are done by specialist teachers or psychologists, not doctors, and most must be paid for [2][3].
• It is supported, not treated: teaching methods, adjustments, access arrangements, Disabled Students’ Allowance and Access to Work [6][7][8].
• Unrecognised difficulty is linked with frustration and low confidence [1].

What dyslexia is

Dyslexia is a specific learning difficulty affecting reading and spelling. It is not a mental health condition, not an illness, and there is nothing to cure. The NHS calls it “a common learning difficulty where your brain works differently to most people”, and states that “it does not affect intelligence” [1].

The UK definition agreed by an expert panel in 2025 describes it as “a set of processing difficulties that affect the acquisition of reading and spelling” [3]. The difficulty seen most often is in phonological processing: hearing and handling the separate sounds inside words [3].

Reading fluency and spelling are the key markers, and difficulties exist on a continuum [3].

If you need help now. Samaritans: call 116 123, free, 24/7. Shout: text SHOUT to 85258. NHS 111, then choose the mental health option. Call 999 if anyone is in immediate danger.

Symptoms

These are signs and characteristics rather than deficits: dyslexia is a difference in how written language is processed, not an illness. They change with age.

At primary age [1]:

• learning to speak later than other children
• reading below the level expected for their age, slow and hesitant aloud
• messy written work, and difficulty with sequences and telling the time

At secondary age:

• reading and writing that take much longer than for classmates
• difficulty taking notes, and spelling the same word several ways on one page
• finding it hard to plan and organise schoolwork

In adults:

• avoiding reading aloud, and rereading to take in the meaning
• slow writing, and heavy reliance on spellcheck or dictation
• difficulty with forms, written instructions and unfamiliar names
• trouble holding sequences in mind, such as numbers or directions
• worry about being found out at work

Dyslexia is commonly confused with ADHD, dyscalculia and dyspraxia, and often occurs alongside them [3]. It is also mistaken for carelessness.

Children who struggle may become frustrated, which can lead to disruptive behaviour or to a child becoming withdrawn at school and at home [1].

Types

Dyslexia has no formally recognised subtypes in UK practice, so this section covers presentations and severity instead. Difficulties exist on a continuum [3].

• Severity bands. Reports describe difficulties as mild, moderate or severe, based on test scores and everyday effect.
• Compensated presentation. Common in adults with years of workarounds: accuracy looks typical, while speed and effort are affected.
• Co-occurring presentation. Dyslexia alongside dyscalculia, ADHD, dyspraxia or developmental language disorder [3].

Causes and risk factors

There is no single cause of dyslexia, and no scan or blood test shows it. What is understood sits at the level of processing [3].

• Difficulties often appear in more than one family member, though no reliable UK figure is published.
• It frequently co-occurs with developmental language disorder, dyscalculia, ADHD and dyspraxia [3].
• It is not caused by low intelligence, laziness or poor parenting [1]. Teaching quality changes how much a child struggles, but does not create dyslexia.
• Coloured overlays and tinted lenses are widely marketed, but the evidence that they help reading is inconsistent.

How it is diagnosed

Dyslexia is identified through a diagnostic assessment by a qualified assessor, not an NHS medical test. These assessments are carried out by experienced specialist teachers and psychologists across the UK [3].

For a child, the usual route is to raise concerns with the school’s special educational needs coordinator, the SENCO, and to see a GP so hearing and vision problems can be ruled out. The SENCO can arrange screening, and a formal assessment follows from an educational psychologist or a specialist teacher [1][5].

A school does not need a diagnosis before it acts. Schools provide SEN support, and those up to 25 with more complex needs can have an Education, Health and Care plan from the local authority [1][5]. Parents can challenge a council decision at the Special Educational Needs and Disability Tribunal [5].

Adults have a narrower route. Assessments are not carried out by doctors and most have to be paid for, so an adult assessment is not usually available on the NHS [2]. Students should contact their university or college disability service, which can arrange study support and help claim Disabled Students’ Allowance. No DSA decision is made until a study needs assessment has happened, which is separate from a diagnostic assessment [7].

A private assessment usually means a few hours with the assessor, a history of schooling and work, tests of reading, spelling, writing speed and memory, and a written report. Fees vary and are not met by the NHS [2]. The report is evidence for adjustments, access arrangements, DSA and workplace support, but it does not change a person’s ability.

Treatment

Dyslexia is supported rather than treated. There is no medication and no NICE clinical guideline, because support sits with schools, colleges and employers rather than the NHS.

• Structured teaching. Small group or one-to-one sessions [1].
• Adaptations in class. Visual aids and technology, such as making screens easier to read [1].
• Assistive technology. Text-to-speech, speech-to-text, screen rulers, sound-based spellcheckers and audiobooks.
• Exam access arrangements. Adjustments made before exams, based on evidence of need and how a student normally works: 25% extra time, a computer reader or a scribe [6].
• Adjustments at work. Employers must make reasonable adjustments so that disabled workers are not substantially disadvantaged [9].
• Funding. DSA covers study-related costs and is not paid back [7]. Access to Work grants cover equipment, assistive software and support workers [8].

Programmes promising to remove dyslexia quickly rest on thin evidence.

Living with dyslexia

Tell the school early and put concerns in writing. Ask the SENCO what SEN support is in place, and your local Information, Advice and Support Service for free independent help [5]. At university, register with the disability service in your first weeks and claim DSA early [7].

At work you do not have to tell your employer, but adjustments are easier to arrange once you have. Dyslexia may count as a disability under the Equality Act 2010 if it has a substantial, long-term negative effect on normal daily activities, lasting 12 months or more [10]. Your employer must then make reasonable adjustments [9]. An Access to Work grant does not affect other benefits and is not paid back [8].

The mental health side is often what people carry longest. Children who struggle can become frustrated, disruptive or withdrawn [1], and adults often describe low confidence and anxiety about writing in front of others, after years of being treated as careless or lazy. That is a response to the experience, not part of dyslexia. If low mood or anxiety has lasted more than two weeks, you can refer yourself to NHS Talking Therapies in England. The British Dyslexia Association also runs a free helpline [4].

When to speak to a professional

• Speak to your child’s SENCO if reading, writing or spelling is behind what you expect, or if schoolwork causes distress. If your child is not at a school or nursery, contact your council [5].
• See a GP if hearing or vision could be part of the picture, since these are checked first [1].
• Contact your university or college disability service if written work is affecting your studies [7], or your manager, HR or Access to Work if it is affecting your job [8][9].
• Refer yourself to NHS Talking Therapies, or see a GP, if anxiety or low mood has lasted more than two weeks.
• If you or someone else is in immediate danger, call 999. Samaritans are on 116 123, free, 24/7, and you can text SHOUT to 85258.

Common questions

Is dyslexia a mental health condition?

No. It is a specific learning difficulty affecting reading and spelling, which the NHS describes as a learning difficulty rather than an illness [1]. Anxiety and low confidence often sit alongside it, and can be treated separately.

Does dyslexia affect intelligence?

No. The NHS states directly that dyslexia does not affect intelligence [1]. It describes difficulty with the processing behind reading and spelling, which is why someone can reason and speak well while their written work does not reflect it.

Can adults be assessed for dyslexia in the UK?

Yes, though usually privately. Assessments are carried out by specialist teachers and psychologists across the UK [3], and because they are not done by doctors and most are paid for, adults do not normally get one on the NHS [2].

Clinical review pending

References

1. NHS. Dyslexia in children. NHS, 2026. https://www.nhs.uk/conditions/dyslexia-in-children/
2. NHS. Dyslexia in adults. NHS, 2026. https://www.nhs.uk/conditions/dyslexia-in-adults/
3. British Dyslexia Association. What is dyslexia? British Dyslexia Association, 2025. https://www.bdadyslexia.org.uk/dyslexia/about-dyslexia/what-is-dyslexia
4. British Dyslexia Association. Dyslexia. British Dyslexia Association, 2026. https://www.bdadyslexia.org.uk/dyslexia
5. GOV.UK. Children with special educational needs and disabilities (SEND). Department for Education, 2025. https://www.gov.uk/children-with-special-educational-needs
6. Joint Council for Qualifications. Access arrangements and special consideration. JCQ, 2025. https://www.jcq.org.uk/exams-office/access-arrangements-and-special-consideration/
7. GOV.UK. Help if you’re a student with a learning difficulty, health problem or disability (Disabled Students’ Allowance). Department for Education, 2025. https://www.gov.uk/disabled-students-allowance-dsa
8. GOV.UK. Access to Work: get support if you have a disability or health condition. Department for Work and Pensions, 2025. https://www.gov.uk/access-to-work
9. GOV.UK. Reasonable adjustments for disabled workers. Department for Work and Pensions, 2025. https://www.gov.uk/reasonable-adjustments-for-disabled-workers
10. GOV.UK. Definition of disability under the Equality Act 2010. Government Equalities Office, 2025. https://www.gov.uk/definition-of-disability-under-equality-act-2010