If my sibling has ADHD, what are the chances that I will have ADHD?

Donna Hill Howes, RN
Family Medicine
If your sibling has attention deficit hyperactivity disorder (ADHD), you have a much higher chance of having ADHD than most people. However, it depends on how similar your genetic makeup is. For instance, if your identical twin has ADHD, then you have a 50% chance of having the disorder. This is 10 times more than most people in the United States, who only have a 5% chance of having ADHD.

If your sibling has ADHD, but is not your twin, then you have a 30% chance of being diagnosed with the disorder. Clearly, there is a genetic link for ADHD. If your sibling has been diagnosed with ADHD and you are concerned about your own symptoms, consult with a doctor or mental health professional.
Dr. Michael Roizen, MD
Internal Medicine

Roughly 30%. While we can’t give you the exact odds, we do know that ADHD runs in families. Interestingly, studies show that siblings of children with ADHD sometimes have trouble in school, even when they don’t have ADHD themselves! It can be hard to focus on your schoolwork when your brother or sister is struggling with ADHD. So talk to your parents about your concerns. Ask them to help you with your homework or to shoot some hoops. It’s important for your future success in life to do well in school, whether you have ADHD or not.


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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.