This site is intended for U.S. healthcare professionals only.
What is ADHD?
Attention-deficit/hyperactivity disorder (ADHD)1 is a brain-based medical condition.
The symptoms of ADHD can occur 24 hours per day, 7 days per week and can interfere with different aspects of your life, including school, work, and social life.
- ADHD is a neurodevelopmental disorder that is “characterized by a persistent pattern of inattention and/or hyperactivity/impulsivity that interferes with functioning or development.”2
- There are three types of ADHD
1
Inattentive (mostly inattentive symptoms)
2
Hyperactive-impulsive (mostly hyperactivity/
impulsivity symptoms)
3
Combined (both inattentive and hyperactivity/
impulsivity symptoms).
The Diagnosis of ADHD in Adults section in this guide talks about inattention and hyperactivity-impulsivity symptoms in more detail.
