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How to Diagnose ADHD Diagnosing ADHD involves gathering a lot of information. Your doctor will review your symptoms and medical history and use the standard ADHD ratings scales. They'll also be sure to ensure that there isn't something else the cause of your child's or adult's problems like sleep apnea or thyroid issues depression, or drug abuse. To be diagnosed, ADHD symptoms must significantly impact school and family life and persist for at least six months. Symptoms A medical professional needs