Attention deficit hyperactivity disorder (ADHD) is a mental health disorder that can cause above-normal levels of hyperactive and impulsive behaviors. People with ADHD may also have trouble focusing their attention on a single task or sitting still for long periods of time.

Both adults and children can have ADHD. It’s a diagnosis recognized by the American Psychiatric Association (APA). Learn about types of ADHD and symptoms in both children and adults.