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Symptoms of ADHD Symptoms of adhd include hyperactivity, inattention and the tendency to be impulsive. Some people are only suffering from one type of symptom. A primary care doctor may be able to diagnose ADHD after reviewing the patient. A specialist, like a developmental-behavioral pediatrician or psychiatrist, may also help with diagnosis and treatment. ADHD must be diagnosed in the early years of childhood (before the age of 12). The behaviors must be problematic in at l