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What Is ADHD? (page 3)

The Nemours Foundation

Causes of ADHD

ADHD is not caused by poor parenting, too much sugar, or vaccines.

ADHD has biological origins that aren't yet clearly understood. No single cause has been identified, but researchers are exploring a number of possible genetic and environmental links. Studies have shown that many kids with ADHD have a close relative who also has the disorder.

Although experts are unsure whether this is a cause of the disorder, they have found that certain areas of the brain are about 5% to 10% smaller in size and activity in kids with ADHD. Chemical changes in the brain also have been found.

Research also links smoking during pregnancy to later ADHD in a child. Other risk factors may include premature delivery, very low birth weight, and injuries to the brain at birth.

Some studies have even suggested a link between excessive early television watching and future attention problems. Parents should follow the American Academy of Pediatrics' (AAP) guidelines, which say that children under 2 years old should not have any "screen time" (TV, DVDs or videotapes, computers, or video games) and that kids 2 years and older should be limited to 1 to 2 hours per day, or less, of quality television programming.

Related Problems

One of the difficulties in diagnosing ADHD is that it's often found in conjunction with other problems. These are called coexisting conditions, and about two thirds of kids with ADHD have one. The most common coexisting conditions are:

Oppositional Defiant Disorder (ODD) and Conduct Disorder (CD)

At least 35% of kids with ADHD also have oppositional defiant disorder, which is characterized by stubbornness, outbursts of temper, and acts of defiance and rule breaking. Conduct disorder is similar but features more severe hostility and aggression. Kids who have conduct disorder are more likely to get in trouble with authority figures and, later, possibly with the law. Oppositional defiant disorder and conduct disorder are seen most commonly with the hyperactive and combined subtypes of ADHD.

Mood Disorders

About 18% of kids with ADHD, particularly the inattentive subtype, also experience depression. They may feel inadequate, isolated, frustrated by school failures and social problems, and have low self-esteem.

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