Attention Deficit Hyperactivity Disorder is the most active kind of Attention Deficit Disorder. The terms ADD and ADHD are not always interchangeable.
It is like how a square(ADHD) is always a rectangle(ADD) but a rectangle(ADD) is not always a square(ADHD).
ADD is a long and varying scale and ADHD is just the more powerful end of it.
A lot of people do not understand ADD or ADHD. I hear many people talking who apparently think that an extra letter sounds good.
submitted by Kyra
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