Attention Deficit Hyperactivity Disorder

ADHD has been extensively researched, but its exact cause is unknown. According to the organization Children and Adults with Attention Deficit Hyperactivity Disorder (CHADD), current research suggests a neurobiological basis for this disorder. This means that there may be an imbalance of neuro-transmitters or a lack of the chemical dopamine, which is used by the brain to control behavior. When individuals concentrate, the brain releases neurotransmitters that enable them to focus on one thing and block out others. People with ADHD seem to have decreased amounts of these neurotransmitters. Some research suggests that abnormal glucose metabolism in the central nervous system may be a possible cause. Research indicates that the areas of the brain that control attention use less glucose, suggesting that these areas are less active for those with ADHD. Other studies suggest that prenatal drug and alcohol exposure may have an effect. Some doctors believe that environmental toxins and chemical additives in food may be the cause. There is no definite agreement on the neurobiological cause of ADHD. There is, however, widespread agreement among researchers that ADHD tends to run in families.