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National Institutes of Health
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How do I know if my child has ADHD?

Your child's doctor may make a diagnosis. Or sometimes the doctor may refer you to a mental health specialist who is more experienced with ADHD to make a diagnosis. There is no single test that can tell if your child has ADHD.

It can take months for a doctor or specialist to know if your child has ADHD. He or she needs time to watch your child and check for other problems. The specialist may want to talk to you, your family, your child's teachers, and others.

Sometimes it can be hard to diagnose a child with ADHD because symptoms may look like other problems. For example, a child may seem quiet and well-behaved, but in fact he or she is having a hard time paying attention and is often distracted. Or, a child may act badly in school, but teachers don't realize that the child has ADHD.

If your child is having trouble at school or at home and has been for a long time, ask his or her doctor about ADHD.