We know that there is not one type of autism, but many.

Autism looks different for everyone, and each person with autism has a distinct set of strengths and challenges. Some autistic people can speak, while others are nonverbal or minimally verbal and communicate in other ways. Some have intellectual disabilities, while some do not. Some require significant support in their daily lives, while others need less support and, in some cases, live entirely independently.

On average, autism is diagnosed around age 5 in the U.S., with signs appearing by age 2 or 3. Current diagnostic guidelines in the DSM-5-TR break down the ASD diagnosis into three levels based on the amount of support a person might need: level 1, level 2, and level 3. See more information about each level.

Among the most common co-occurring conditions are:

attention-deficit/hyperactivity disorder (ADHD)

anxiety and depression

gastrointestinal (GI) disorders

seizures and sleep disorders

Anybody can be autistic, regardless of sex, age, race or ethnicity. However, research from the CDC says that boys get diagnosed with autism four times more often than girls. According to the DSM-5-TR, the diagnostic manual for ASD, autism may look different in girls and boys. Girls may have more subtle presentation of symptoms, fewer social and communication challenges, and fewer repetitive behaviors. Their symptoms may go unrecognized by doctors, often leading to underdiagnosis or misdiagnosis. Getting a diagnosis is also harder for autistic adults, who often learn to “mask”, or hide, their autism symptoms.

Autism is a lifelong condition, and an autistic person’s needs, strengths and challenges may change over time. As they transition through life stages, they may need different types of support and accommodations. Early intervention and therapies can make a big difference in a person’s skills and outcomes later in life.