A trio of studies make the strongest case to date for shared genetic roots between autism and attention deficit hyperactivity disorder.

Children born to parents who are unusually young or old stand an increased chance of having features of autism or other psychiatric conditions.

Many people on the spectrum take multiple medications — which can lead to serious side effects and may not even be effective.

Conventional wisdom holds that people with autism don’t get hooked on alcohol or other drugs, but new evidence suggests otherwise.

People with autism tend to partner with others on the spectrum, which may raise the condition’s prevalence within families and across the population.

A DNA deletion linked to autism causes male mice, but not females, to have trouble falling asleep.

A drug called atomoxetine eases hyperactivity in children who have both autism and attention deficit hyperactivity disorder.

Genes linked to autism are associated with a variety of other ailments, including cancer, heart conditions, autoimmune disorders and gut problems.

Children who officially lose their autism diagnosis show no residual signs of the condition.

About 1 in 10 toddlers who have an older sibling with autism have cognitive and motor delays.