Disorders

What is autism spectrum disorder?

Reviewed July 2026 by Peter Raffalli, MD, FFAP

Definition: Autism spectrum disorder is a developmental condition that affects how a person communicates, connects with others, and experiences the world.

Autism is called a “spectrum” because it affects each person differently. Some people need more daily support, while others live independently. Signs usually begin early in childhood and can vary based on age, language, and learning differences.

Autism can affect:

  • Communication
  • Social interaction
  • Problem-solving
  • Daily living skills

Symptoms fall into two main areas:

  • Differences in how you communicate with others
  • Repetitive behaviors and routines

Many people with autism also have other conditions, such as anxiety, ADHD, or sleep problems.

About 1 in 31 children are diagnosed with autism in the United States.

What are the symptoms of autism?

Autism shows up in different ways. No two people are exactly alike.

Social communication and interaction

A person with autism may:

  • Have trouble with back-and-forth conversation
  • Make less eye contact
  • Have difficulty understanding social cues or relationships

Restricted or repetitive behaviors

A person with autism may:

  • Repeat movements or words
  • Prefer routines and find change hard
  • Have strong, focused interests
  • Be sensitive to sounds, lights, or textures

Symptoms can be mild or more noticeable and may change over time.

Early signs in young children may include:

  • Not responding to their name by the time they’re 12 months old
  • Limited gestures, such as pointing
  • Delayed speech
  • Limited interest in social interaction
  • Loss of skills they already had

If you’re a parent, talk to your doctor if you notice these signs. Early evaluation can help your family find support sooner.

What causes autism?

There is no single known cause of autism. Researchers believe that genes play a major role, and environmental factors may also contribute.

Autism is not caused by parenting or vaccines.

How is autism diagnosed?

Doctors diagnose autism based on your development and behavior, observations by trained professionals, and standard screening tools.

Children are often screened at 18 and 24 months. However, you can get screened for autism at any age. Talk to your doctor if you think you may have autism and are interested in diagnosis and support.

A full evaluation may include:

  • Developmental testing
  • Speech and language evaluation
  • Behavioral assessment

Doctors may also suggest genetic testing, hearing tests, or vision tests.

A pediatric neurologist with expertise in autism can diagnose your child by interacting with them and considering their developmental history. Doctors often use a standard assessment called the Autism Diagnosis Observation Schedule. However, this test may not be needed if criteria from the DSM-5 (a guide used to diagnose mental health and related conditions) are clearly met.

There is no cure for autism, but early and ongoing support can help people learn, communicate, and live well.

Therapies

Common therapies include:

  • Behavioral therapy, such as applied behavior analysis
  • Speech therapy
  • Occupational therapy
  • Play-based or developmental therapy

Behavioral therapy is the most common type of care for people with autism. It can help with communication, learning, social skills, and daily life skills. Autism care should be personalized, family-centered, and consistent over time.

Medications

Medicines don’t treat autism itself. However, they may help with related symptoms such as irritability, anxiety, hyperactivity, and sleep problems.

Other supports

  • School-based services: This could include individualized education programs (IEPs) and sensory accommodations to help a child or teenager succeed.
  • Family and caregiver support: This could include skills training, respite care, and counseling.
  • Individualized care plans: Having a consistent resource for information and planning can help you navigate care with confidence.

Living well with autism

People with autism live full, meaningful lives. Support needs are different for everyone, and they may change over time. Care can look different at each stage of life:

  • Children: Early therapy and school supports
  • Teens: Social skills and independence planning
  • Adults: Support for work, housing, relationships, and ongoing care

Caring for and navigating autism

Explore practical tips, personal stories, and expert guidance for living well with autism.

Frequently asked questions

Can people with autism live independently?

Some people live independently, and others need ongoing support. Every person with autism is different.

Is autism more common in boys than girls?

Autism is diagnosed more often in boys. Girls may be underdiagnosed, especially if their symptoms are less obvious.

Do vaccines cause autism?

No. Vaccines do not cause autism. Large studies show no link between autism and vaccines.

What does the “spectrum” mean?

“Spectrum” means autism can look very different from person to person. Symptoms and support needs vary widely.