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Symptoms of ADHD Hyperactivity, inattention and impulsivity are all symptoms of adhd. Some people only experience one type of symptom. A primary care provider can assess and make a diagnosis of ADHD. A specialist, like a developmental-behavioral pediatrician or psychiatrist, may also help with diagnosis and treatment. ADHD must be diagnosed in early childhood (before the age of 12). The behavior must be challenging in at least two different settings. Inattentio