Attention-deficit/hyperactivity disorder (ADHD) tends to run in families.¹³ Because ADHD has a genetic basis, when one family member is diagnosed, you may want to look for symptoms of ADHD in other family members.

• If you have a parent with ADHD, your risk for having the disorder is over 50%

• If your sibling has ADHD, your risk for having the disorder is 41%

• If your child has ADHD, your risk for having the disorder is 29%

• If your identical twin has ADHD, your risk for having the disorder is 80%¹³