Overview
Autism spectrum disorder (ASD) is a neurodevelopmental condition affecting how a person communicates, interacts with others, and experiences the world. The word 'spectrum' reflects the wide range of abilities and challenges. Autism is not an illness to be cured; it is a different way the brain develops and processes information.
How common is it?
About 1 in 100 people in the UK is autistic. It is more commonly diagnosed in males, though females are increasingly recognised as many were missed by older diagnostic criteria.
Causes and risk factors
Autism results from differences in early brain development. Both genetic and environmental factors during pregnancy contribute. It is not caused by vaccines, parenting style, or anything done during pregnancy.
Common risk factors
- Genetic factors (strong heritable component)
- Advanced parental age
- Premature birth
- Genetic conditions such as Fragile X syndrome
- Certain medications taken during pregnancy (e.g. valproate)
- Multiple birth (twins have higher concordance)
Symptoms
- Difficulty understanding or using non-verbal communication (facial expressions, gestures)
- Preferring routine and becoming distressed by unexpected changes
- Intense, highly focused interests in specific topics
- Difficulty reading social situations or understanding unspoken rules
- Sensory sensitivities: over- or under-reaction to sounds, lights, textures, tastes
- Taking language very literally
- Repetitive movements such as rocking or hand-flapping
When to see a doctor
Ask your GP for an assessment referral if you are concerned about social communication, repetitive behaviour, or sensory differences in a child or in yourself as an adult. Early support makes a significant difference.
Diagnosis
Diagnosis involves structured observations and interviews with specialists (often a child psychiatrist, psychologist, and speech therapist working as a team). In adults, a detailed developmental history is taken. There is no blood test or brain scan for autism.
Treatments
Speech and language therapy
Supports communication skills, including understanding and using spoken language, non-verbal communication, and social interaction.
Occupational therapy
Helps with sensory processing, daily living skills, and adapting environments to reduce overwhelm and support independence.
Educational and behavioural support
Structured teaching approaches, support in mainstream or specialist school, and strategies for managing anxiety and change help autistic people thrive.
Self-care and lifestyle
- Predictable routines and visual schedules reduce anxiety
- Reduce sensory overload by adapting environments (noise-cancelling headphones, dimmer lighting)
- Connect with the autistic community for peer support and practical strategies
- Look for autism-friendly employers, social groups, and services
Prevention
Autism cannot and should not be prevented. The focus should be on identifying autistic people early so they receive appropriate support and understanding.