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

The part of the nervous system that regulates heart rate and breathing may be involved in autism.

Some children who dramatically lose a range of abilities after age 2 may have a condition called childhood disintegrative disorder.

A count of genetic variants may help predict a person’s risk of various conditions — but its clinical use prompts ethical questions.

Una remota ciudad colombiana es el hogar del grupo más grande de personas con síndrome de X frágil. Los científicos están aprendiendo de ellos y tratando de ayudar.

Genetic tests for people with autism are far from routine and don’t always yield results, but the information they offer can change lives.

Traits associated with autism and gender variance may co-occur even among typical children — a finding that may ease some of the skepticism about the overlap.

Three distinct categories of traits best characterize autism, according to a study of more than 6,000 children.

Coaching caregivers in early-intervention strategies may be the most effective way to help young autistic children in South Africa.

Children who have an older sibling with attention deficit hyperactivity disorder are at an increased risk of having autism. The reverse is also true.