In short: Autism signs fall into two areas: differences in social communication, and restricted or repetitive patterns such as routines, intense interests and sensory sensitivities. Autism looks very different from person to person.
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Autism (autism spectrum disorder, ASD) is a lifelong neurodevelopmental difference in how people communicate, process sensory information and experience the world. Signs are present from early childhood, though they may not be recognised until later.
Social communication signs
- Finding unwritten social rules confusing or tiring
- Preferring direct, literal communication
- Eye contact that feels uncomfortable
- Difficulty with small talk; enjoying deep conversations about interests
- Needing time alone to recover after socialising
Repetitive behaviours, routines and interests
- Strong preference for routine; distress when plans change
- Intense, focused interests
- Stimming — repetitive movements or sounds that help regulate
- Sensory sensitivity (noise, light, textures, smells) or sensory seeking
Autism signs in adults
Adults often describe a lifelong feeling of being “different”, exhaustion from masking, burnout, and a sense of relief when they learn about autism. Read autism tests for adults.
Autism signs in girls and women
Autistic girls and women often camouflage social differences and have socially acceptable interests, so they are diagnosed later or misdiagnosed with anxiety or depression.
What happened to Asperger’s?
“Asperger’s syndrome” was merged into autism spectrum disorder in the DSM-5 (2013). Some people still identify with the term; clinicians now diagnose ASD with a description of support needs.
Autism signs in toddlers and children
Parents: our Kids & Parents hub has an age-by-age guide in Signs by Age.
Where to next?
Adults: late diagnosis, burnout, treatment, “do I have it?”I’m here for my child →
Parents: signs by age, assessment, school, support
Sources & further reading
- NHS — Signs of autism
- CDC — Signs and symptoms of autism spectrum disorder
- Autism South Africa
- Embrace Autism — autism strengths and challenges
Last checked: 31 October 2026. If you spot something out of date, tell us.