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    www.webmd.com/add-adhd/default.htm ADHD affects an estimated 3% to 5% of children and adults in the U.S. Get ADD and ADHD information here including its causes, diagnosis, and promising treatments.
  • ADD vs. ADHD: What's the Difference? - Healthline

    www.healthline.com/health/adhd/difference-between-add-and-adhd Learn the difference between ADD and ADHD and the three types of ADHD: inattentive, hyperactive/impulsive, and combined hyperactive/impulsive and inattentive.
  • NIMH » Attention Deficit Hyperactivity Disorder

    www.nimh.nih.gov/health/topics/.../index.shtml What is Attention Deficit Hyperactivity Disorder (ADHD, ADD)? Attention deficit hyperactivity disorder (ADHD) is one of the most common childhood disorders and can ...