Attention-Deficit Hyperactivity Disorder is having constant hyperectivity and thinking that they dont get enough attention. There are some characteristics that show signs of ADHD, an example would be having a hard time sitting still, some behavior issues. The illness begins at childhood and can last for any amount of time. Nobody is prone to the illness, nine percent of children get the illness at birth."the Harvard/NIMH National Comorbidity Survey Replication found 4.4% percent of adults, ages 18-44 in the United States, experience symptoms and some disability." ADHD has no cure, but medication can be taken to prevent the severity of the illness. Heredity is the most common cause of the illness. ADHD can result in low self esteem. One kind of medication for ADHD is Dexamphetamine.