New research shows that nearly a third of children with autism may present signs of ADHD as well.
Doctors at the Kennedy Krieger Institute found that 29 percent of autistic children in a recent study also exhibited problems with attention.
All were boys, who have higher rates of autism and ADHD than girls, research shows.
The children in the study who showed signs of ADHD tended to have more difficulty learning and socializing than children who had autism only.
Researchers said that these children may benefit from ADHD treatments even if they aren't moving forward with autism therapies, which often require sustained focus on specific skills.