The relatives of autistic people often have mild traits of the condition. Studying these family members could broaden our understanding of autism.

Two drugs that alter the activity of the hormone vasopressin seem to improve social communication in autistic people, but some experts question the findings.

Nearly all children who lose their autism diagnosis have other conditions, such as anxiety and language and behavioral disorders.

A new parent questionnaire is the first test designed to gauge anxiety in children with autism.

Depression may show up in children with autism in an unusual way — most commonly as insomnia and restlessness.

The brain’s emotion center, the amygdala, undergoes dramatic changes during the first year of life; these shifts may hold hints about its role in autism.

Scientists have created five monkey clones, all carrying an edit to a specific gene.

A study of more than 5 million people reveals the onset and prevalence of nine diagnoses that often accompany autism.

Autism and obsessive-compulsive disorder frequently accompany each other; Scientists are studying both to understand how they differ.

Clinicians need to be able to distinguish autism from post-traumatic stress disorder so they can provide the right support.