In short
- Autism is a lifelong developmental difference that affects how a person communicates, relates to others, experiences the senses, and moves through daily life.
- Every autistic person is different. Strengths and support needs vary from person to person and can change over time.
- A diagnosis is made by qualified professionals. This guide is general education, not a diagnosis or medical advice.
What autism is
Autism, often called autism spectrum disorder (ASD) in medical settings, is a developmental disability linked to differences in how the brain develops. Federal health agencies such as the CDC describe it as affecting communication, social interaction, and behavior.
Many autistic people also describe autism as a part of who they are — a different way of thinking and experiencing the world, with its own strengths and challenges. Both the medical description and lived experience can be true at the same time.
Why it is called a spectrum
“Spectrum” means autism looks different in different people. One person may speak fluently and find busy places exhausting; another may communicate without speech and need support with daily routines. There is no single autistic personality, appearance, or ability level.
Ways autism can show up
Not every autistic person experiences all of these, and none of them alone means someone is autistic.
- Communication differences — for example, taking language literally, communicating with devices, signs, or writing, or finding back-and-forth conversation tiring.
- Social differences — different ways of making eye contact, showing interest, or connecting with others.
- Sensory differences — sounds, lights, textures, smells, or tastes may feel much stronger or weaker than they do for others.
- Focused interests and routines — deep interests and predictable routines can bring comfort, joy, and expertise.
- Repetitive movements, sometimes called stimming — rocking, hand movements, or sounds that can help with regulation or expression.
Talking about autism respectfully
Some people prefer identity-first language (“autistic person”); others prefer person-first language (“person with autism”). The respectful choice is to ask, and to follow the person’s own preference. ABMC follows each storyteller’s preference.
Avoid describing autism as a tragedy or something to be pitied, and avoid assuming what someone can or cannot do based on how they speak or move.
Concerned about development?
If you have questions about a child’s development, the CDC’s free “Learn the Signs. Act Early.” materials describe milestones and what to do next. Talking with a pediatrician or primary care provider is a good first step. Adults who wonder whether they may be autistic can also ask a primary care provider about an evaluation.
Practical next steps
- Watch ABMC’s short explainer and hear autistic people describe their own experiences.
- If you have developmental concerns about a child, review the CDC milestone materials and talk with your child’s doctor.
- If someone you love was recently diagnosed, read our first-steps guide next.
When to contact a qualified professional
- You or a family member notice ongoing differences in communication, play, social connection or daily routines and want to understand them better — a pediatrician or primary-care clinician can explain screening and evaluation options.
- A child seems to lose skills they already had, such as words or social engagement. Mention this to a healthcare professional promptly rather than waiting.
- Daily life is becoming hard to manage for the person or the family. Support can be useful whether or not anyone has a formal diagnosis.
Common questions
- Is autism an illness that needs a cure?
- Autism is described by health agencies as a lifelong developmental disability, and many autistic people describe it as part of who they are. Support aims to help a person communicate, learn and live well on their own terms, not to change who they are.
- Can adults be autistic without knowing it?
- Yes. Some people are not identified as autistic until adulthood. An adult who wants to explore this can ask a primary-care clinician about professionals who evaluate adults.
- Does one video or article tell me whether someone is autistic?
- No. General information can help you ask better questions, but only qualified professionals can make a diagnosis.