What is ADHD? | APA

An estimated 8.4% of children and 2.5% of adults have ADHD. ADHD is often first identified in school-aged children when it leads to disruption in the classroom or problems with schoolwork. It is more commonly diagnosed among boys than girls given differences in how the symptoms present. However, this does not mean that boys are more likely to have ADHD. Boys tend to present with hyperactivity and other externalizing symptoms whereas girls tend to have inactivity.

There are three main types of ADHD:
- Predominantly inattentive presentation.
- Predominantly hyperactive/impulsive presentation.
- Combined presentation.

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