Sean Peters was excited about beginning the third grade, but, as he started, things did not go well. He was constantly getting in trouble for not sitting still. His parents were disappointed in him because he was getting bad grades, and his baseball team blamed him for losing the game. Sean did not know what was wrong with him. He was fidgety at his desk all the time and could not concentrate. He started to feel isolated from his family and friends. He could not understand why he was not like everyone else. Finally, his mother took him to a doctor. Sean was diagnosed with attention deficit/hyperactivity disorder (ADHD). Learn more about ADHD and what happens to Sean next.