Studies show that about a third of children with ADHD also suffer from anxiety disorders. Symptoms include unwarranted worrying, fear, and panic, which can manifest as a racing heart, profuse sweating, stomach aches, and intestinal distress. Other types of anxiety that often go along with ADHD include obsessive-compulsive dis-order. If your child is suffering from anxiety, he may also have sleep problems.

About 18 percent of children with ADHD, and especially those with the inattentive subtype of ADHD, suffer from some sort of depression. Usually, children with ADHD and depression have family members who suffer from depression as well. Children who are depressed may feel unloved or unwanted, feel inadequate, lack self-esteem and confidence, and feel overly frustrated by failures in school and with friends.