08/21/2026
ADHD ADHD is a developmental conditionTrusted Source that involves persistent symptoms of inattention, hyperactivity, and impulsivity. Some people with ADHD may mostly have symptoms of inattention, while others have symptoms of hyperactivity and impulsivity. In some cases, individuals may have both types of symptoms. Roughly 8.4% of children in the U.S. have ADHD. In some cases, characteristics of ADHD can present as early as 3 years of age. Research into possible causes of ADHD is still ongoing. Potential causes may include: Genetics: ADHD often runs in families. A child with ADHD has a 1 in 4 chance of having a parent with the condition. Prenatal exposures: Exposure to alcohol or ni****ne from smoking during pregnancy increases the risk of ADHD. Prematurity: Babies born before 37 weeks of pregnancy are at a higher risk of developing ADHD. Environmental toxins: Certain toxins, such as lead, can affect child development and behavior. Head injuries: In some cases, significant head injuries may cause ADHD. Brain anatomy and function: Some research associates lower levels of activity in the parts of the brain that control attention and activity in those with ADHD. Treatments for managing ADHD typically involve Trusted Source a combination of medication and therapy. It is also highly advisable for caregivers to receive training to help their child manage the condition.