ADHD, or attention deficit hyperactivity disorder, is a behavioral disorder that affects a person's ability to focus and pay attention. ADHD was once called ADD, or just attention deficit disorder. The cause of ADHD is unknown. Common symptoms of ADHD include being easily distracted, frequent daydreaming, forgetfulness, impulsive behaviors, difficulty sitting still and listening, and difficulty following instructions. People with ADHD may show symptoms of inattention, hyperactivity, and/or impulsivity. ADHD symptoms usually appear in childhood, but may not be diagnosed until adulthood. There is no cure for ADHD, but symptoms can be managed with medication and therapy to learn methods that improve focus.
