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How to Diagnose ADHD The process of diagnosing ADHD requires gathering a lot of information. Your doctor will look at your symptoms and medical history, and then use standard ADHD ratings scales. They'll also check to ensure that there isn't something else causing your child's or adult's problems like sleep apnea, thyroid issues depression, depression, or abuse. To be diagnosed, ADHD symptoms must significantly interfere with family and school activities and last fo