About ADHD

The causes of ADHD are still not clearly understood, but genetics, environment, and problems with the nervous system at key points in development may all play a role.

ADHD symptoms usually start before age 12 and can occur as early as 3 years of age. These symptoms may continue into adulthood.

ADHD is usually categorized into three types:

Inattentive icon
Inattentive ADHD

Symptoms may include inattention to details, difficulty focusing on tasks, difficulty with organization, and forgetfulness.

Hyperactive icon
Hyperactive ADHD

Symptoms may include difficulty sitting still, interrupting someone who is speaking, disturbing someone else’s activities and talking constantly.

Combination icon
Combination ADHD

Symptoms are a combination of those seen in children with inattentive ADHD and hyperactive ADHD.

Children and adults with ADHD may often understand what’s expected of them but have trouble following through because they can’t sit still, pay attention, or focus on details.

While all children may occasionally struggle with some of the behaviors associated with ADHD, children with ADHD have noticeable difficulty modifying their behaviors over a sustained period of time (at least 6 months). If you notice any symptoms that interfere with your child’s school or social behaviors, discuss these concerns with your child’s doctor.

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