Attention deficit hyperactivity disorder (ADHD) is a neurodevelopmental mental disorder. It's characterized by problems in paying attention, excessive activity, or difficulty in controlling behavior (typically not appropriate for a person's age). Symptoms ususally begin at between six to twelve years of age, and, to be classified as ADHD must be present for more than six months and cause problems in at least two settings (e.g. school, home, or in recreational activities).
The causes are as yet unknown, but genetic, environmental and societal factors are known to affect its prevalence.
“Scientists are studying cause(s) and risk factors in an effort to find better ways to manage and reduce the chances of a person having ADHD. The cause(s) and risk factors for ADHD are unknown, but current research shows that genetics plays an important role.”
Source: US Centers for Disease Control and Prevention
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