Attention Deficit Hyperactivity Disorder (ADHD) Attention deficit hyperactivity disorder (ADHD) is a group of behavioural symptoms that include inattentiveness, hyperactivity and impulsiveness.
Attention deficit disorder (ADD) is a sub-type of ADHD. Common symptoms of ADHD include: a short attention span restlessness or constant fidgeting being easily distracted. Attention Deficit Disorder (ADD) / Attention Deficit Hyperactivity Disorder (ADHD) ADDstudy.org.