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How to Diagnose ADHD The process of determining ADHD requires a lot of information. Your doctor will look at your symptoms as well as your medical history and apply the standard ADHD ratings scales. They'll also check to ensure that there isn't something else causing your child's or adult's problems for example, sleep apnea, thyroid issues, depression, or substance abuse. ADHD symptoms are a major issue in the family and at school, and persist for at least six months before they can be identifi