This article or section may be confusing or unclear for some readers, and should be edited to rectify this. Please improve the article, or discuss the issue on the talk page. PET scans measure the activity of various parts of the brain. The image on the left illustrates areas of activity in the brain of a person without ADHD while doing an assigned task. The image on the right illustrates the areas of activity of the brain of someone with ADHD when given that same task. There is some contr ...
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What Causes ADHD?
... ADHD has no known cause and is largely considered a genetic disorder. ADHD is a problem of the brain and nervous system. It is not caused by home or school situations or by poor parenting. Studies of ...
Source: Cleveland Clinic

Diagnosing ADHD in Children
... There is no single test for ADHD. ADHD is diagnosed after a child has shown some or all of 18 symptoms of ADHD on a regular basis for more than 6 months. Health care providers can diagnose ADHD with t...
Source: Cleveland Clinic

Signs and symptoms
... At various times, ADHD has been called attention-deficit disorder (ADD), hyperactivity, and even minimal brain dysfunction. But ADHD is the preferred term because it more accurately describes all aspe...
Source: MayoClinic

Causes
... Parents often blame themselves when a child has been diagnosed with ADHD, but scientists increasingly believe that structural changes in the brain, not parenting, may be a leading cause of the disorde...
Source: MayoClinic

When to seek medical advice
... In the 1990s, diagnosed cases of ADHD in the United States increased dramatically. The number of children with a diagnosis of the disorder climbed from 950,000 in 1990 to more than 2.4 million in 1996...
Source: MayoClinic

Screening and diagnosis
... No single test for ADHD exists, making the disorder difficult to diagnose. But a variety of exams are used to differentiate ADHD from learning disabilities and mood disorders. For this reason, make su...
Source: MayoClinic

   

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