While the term ADD, or attention-deficit disorder, has become increasingly popular among laypersons,
ADHD, or attention-deficit/hyperactivity disorder, is the only clinically diagnosed term for disorders characterized by inattention, hyperactivity, and impulsivity used in the American Psychiatric Association’s Diagnostic and Statistical Manual of Mental Disorder, Fourth Edition.
There are actually three different types of ADHD, each with different symptoms: predominantly inattentive, predominantly hyperactive/impulsive, and combined.
Some professionals use the term ADD to refer to the predominantly inattentive type of ADHD.
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