ADHD is a disorder that makes it difficult for a person to pay attention and control impulsive behaviors. He or she may also be restless and almost constantly active.
People with ADHD show an ongoing pattern of three different types of symptoms:
Difficulty paying attention (inattention)
Being overactive (hyperactivity)
Acting without thinking (impulsivity)
ADHD is not just a childhood disorder. Although the symptoms of ADHD begin in childhood, ADHD can continue through adolescence and adulthood. Even though hyperactivity tends to improve as a child becomes a teen, problems with inattention, disorganization, and poor impulse control often continue through the teen years and into adulthood.