What is ADHD? ADHD, or Attention-deficit/hyperactivity disorder is a chronic condition that affects millions of children, and can continue into adulthood if improperly treated. It includes a combination of problems, such as difficulty sustaining attention, hyperactivity and impulsive behavior. What is ADHD?If you know anyone that may have this condition, share this post and look for help as soon as possible. Try to go as natural as possible.