What is Autism?

What is Autism?

Autism (also known as Autism Spectrum Disorder or ASD) is a lifelong neurodevelopmental difference. It affects how someone communicates, processes social information and experiences in the world; this includes sounds, light, textures, routines and emotions.

Autism is a spectrum, which means there’s a huge range of traits, strengths and support needs. No two autistic people are the same.

Clinically, autism is identified by:

• Differences in social communications and interaction.
• Patterns of repetitive behaviours, focussed interests, routines or sensory differences.

These traits are present from early development and can impact everyday life, especially in environments not designed with autistic people in mind.

How Common is Autism?

Autism is far more common than many people realise.

In the UK, it’s generally estimated that more than 1 in 100 people are autistic: around 700,000 adults and children.

The real number is likely higher as many adults remain undiagnosed – especially in women and non-binary people.

Diagnosis rates have risen largely due to better awareness and screening, not because autism is ‘increasing’.

What Autism Can Look Like

Autism doesn’t look one specific way. Common experiences include:

• Different communication styles – for example, being more literal, needing extra time to process speech or finding small talk exhausting.
• Strong interests, routines, or repetitive movements and speech.
• Sensory differences, either being over or under sensitive to sound, light, touch, taste or textures.
• Masking, also known as camouflaging, is where someone hides autistic traits to fit in, often unconsciously. This is especially common in girls, women and some non-binary people, and can lead to late diagnosis, burnout, anxiety and depression.

Alongside challenges, many autistic people have significant strengths, including:

• Deep focus and attention to detail.
• Ability to spot and recognise patterns.
• Strong sense of honesty and fairness.
• Specialist knowledge and creative problem solving.

Autism isn’t a flaw, but living in a world not designed for autistic people can be exhausting.

What Causes Autism?

There is no single cause of autism.

Research shows that autism is strongly genetic, with heritability estimated around 80%. Hundreds of genetic differences are involved. Environmental factors during pregnancy may also play a role. Autism is not caused by vaccines or Paracetamol (Tylenol in US).

Large, high-quality studies and reviews, including WHO, have found no credible link between autism and childhood vaccines, including MMR.

Early Signs and Screening

Some autistic traits can appear early, often between 12 and 24 months old, including:

• Reduced response to name.
• Fewer gestures, like pointing and waving.
• Differences in speech development.
• Strong sensory reactions.
• Limited shared attention, for example not looking when someone points.

Professionals might use lots of screening tools as a first step towards diagnosis. These screening tools are not diagnosis on their own but should lead to a full assessment.

How Diagnosis Works

In children and young people, NICE guidelines cover referral, diagnosis and support. Assessments are usually done by a multidisciplinary team and may include developmental history, observation and standardised tools.

In adults, NICE guidelines recommend initial screening in primary care followed by full diagnostic assessment if appropriate.

Waiting lists are long. By mid-2023, over 143,000 people living in England were waiting for an autism assessment, with many waiting for months or longer. If you wish to be assessed, speak to your GP about Right to Choose to see if you can get assessed quicker.

Co-Occurring Conditions

Autism often co-occurs with other conditions, including:

• ADHD
• Anxiety and Depression
• Sleep Difficulties
• Gastrointestinal Issues
• Epilepsy (around 10-20%, higher where intellectual disability is present)

Autistic people also experience worse health outcomes overall, largely due to barriers to healthcare, delayed diagnosis, and lack of reasonable adjustments, not autism itself.

What Actually Helps?

There is no cure for autism, and that’s not the goal.

Support should be focussed on reducing distress, increasing autonomy, and improving quality of life, on the autistic persons terms.

Evidence based support includes:

Development and Behavioural Supports

Naturalistic approaches build communication and daily living skills within everyday routines. Outcomes vary, but many show meaningful benefits.

Speech and Language Therapy

Communication supports, including Augmentative and Alternative Communication (AAC) can be life changing. AAC does not sop speech, it often supports it.

Occupational Therapy and Sensory Support

Helps with daily living, regulation and navigating sensory environments when delivered in a neuro-affirming way.

Medication

There is no medication for autism itself, some medications may help with severe distress, irritability, anxiety, ADHD, or sleep issues when used carefully and alongside non-drug support.

Good care is personalised, flexible and collaborative; it will adapt over time as needs change.

School, University and Work

Autism is a disability under the Equality Act in the UK, meaning autistic people are entitled to reasonable adjustments such as clear written instructions, predictable routines, quiet spaces, flexible lighting or noise adjustments and assistive technology.

These adjustments aren’t about ‘special treatment’, they’re about reducing barriers and levelling the playing field.

Key Takeaways

Autism is a lifelong neurodevelopmental difference, not a disease.

It’s common: over 1 in 100 people in the UK have an autism diagnosis.

The right, person centred support can significantly improve wellbeing and participation.