Autism may be just as common among children missing a segment of chromosome 16 as it is in those with an extra copy.

An analysis of DNA from more than 20,000 people with autism identifies 12 regions in the genome that harbor inherited risk factors for the condition.

About one in three autistic people in the United Kingdom is prescribed drugs designed to alter brain function.

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

Traits linked to autism and attention deficit hyperactivity disorder tend to co-occur even in adulthood.

The number of children diagnosed with attention deficit hyperactivity disorder (ADHD) has reached more than 10 percent, a significant increase during the past 20 years, according to a new study.

Fearfulness and shyness in babies and toddlers may predict features of autism at age 7.

Children born to women who had diabetes or high blood pressure while pregnant may be at an increased risk of autism.