What causes ADHD?

Studies have shown that many genes are linked to ADHD, and each gene plays a small role in the disorder. This disorder is complex and there is no testing available just yet to determine and diagnose it. As for the non-genetic factors that could contribute to a child's risk for developing ADHD include - Smoking or drinking during pregnancy. - Birth complications or very low birth weight - Exposure to lead or other toxic substances - Extreme neglect, abuse, or social deprivation. - Food additives like artificial coloring, which might make hyperactivity worse. http://www.nimh.nih.gov/health/publications/attention-deficit-hyperactivity-disorder-easy-to-read/index.shtml

Attention deficit hyperactivity disorder (ADHD) symptoms—inattention, impulsivity, and/or hyperactivity—affect a child's ability to learn and get along with others, some people think an ADHD child's behavior is caused by a lack of discipline, a chaotic family life, or even too much TV. In fact, research suggests that ADHD is largely a genetic disorder. http://www.health.com/health/gallery/0,,20441463,00.html However, some environmental factors may play a role as well.