What is ADHD?

Find definition of ADHD

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Attention-Deficit/Hyperactivity Disorder (ADHD) is a treatable, neurobehavioral disorder found in kids, teens, and adults.

ADHD definition
and facts

Here is a list of essential ADHD information you might find helpful. And, of course, talk to your doctor to learn more.

  • ADHD stands for Attention-Deficit/
    Hyperactivity Disorder. Some people call it ADD, but ADHD is the correct name for it.
  • There are 3 main types of ADHD: predominantly inattentive, predominantly hyperactive/impulsive, and combined type.
  • Anyone can have moments of being inattentive, impulsive, or hyperactive. Adults with ADHD, however, experience these symptoms repeatedly and in a way that is severe enough to have an impact at home, at school/work, or in social situations.
  • ADHD is a treatable medical disorder. The exact cause of ADHD is unknown but researchers believe it may be caused in part by an imbalance in chemical messengers that affect the brain.
  • Only a doctor or other healthcare professional can accurately diagnose ADHD.
  • It is estimated that nearly 17 million Americans are affected by ADHD. Need some context? The state population of New York is just over 19 million.
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Approximately 4.4% or 10.5
million adults are estimated to have ADHD.*

*Based on a survey of 3,199 adults aged 18 to 44 conducted from 2001-2003 and applied to the full US population in 2011, aged 18 and over.

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