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Symptoms of ADHD Symptoms of adhd include hyperactivity, inattention, and the tendency to be impulsive. Some people only have one kind of symptom. A primary care provider may determine ADHD after evaluating 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 troublesome in at least two different settings.