What's the difference of add and adhd?

YES. Add is simply a shortened way to say adhd. The official diagnosis is adhd & then clinician specifies subtype based on symptom presentation. A skilled child or adult clinician (psychiatrist, neurologist, pediatrician, psychologist, & others) will conduct a comprehensive evaluation and recommend a mutlifacted treatment. A good source of info is additude magazine: http://www.Additudemag.Com/.
No difference. Add is the same as adhd - inattentive type. One was in the dsm-iv and the other was dsm iii.