ADHD is the most common behavioral disorder of childhood, affecting 3 to 7 percent of school-age children. The three main symptoms of ADHD in children include inattention, hyperactivity, and a tendency to be impulsive. These qualities can lead to difficulties in school, poor interaction with other children and adults, and low self-esteem. Related disorders may include anxiety, depression, difficult behavior, tics, and learning disabilities.
-Genetics
-Brain injury
-Environmental exposure
-Consumption of alcohol or tobacco
During pregnancy.
-Premature birth
-Low birth weight