About CHADD Understanding AD/HD Support Membership Conferences & Training AD/HD Online Store
 

ADD or AD/HD?

AD/HD (attention-deficit/hyperactivity disorder) is the term now used for a condition that has had several names over the past hundred years. Science recognizes three subtypes of AD/HD (inattentive, hyperactive-impulsive, and combined).  A diagnosis of one type or another depends on the specific symptoms (the "diagnostic criteria") that person has.  Learn more...

National Resource Center on AD/HD 


For in-depth information on this and many other topics,
see the complete list of 
What We Know info sheets on AD/HD.

Ask a Question about AD/HD

Home Contact Join CHADD E-News Privacy Policy Site Map Donate