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Medical conditions which can cause ADHD type symptoms include: hyperthyroidism, seizure disorder, lead toxicity, hearing deficits, hepatic disease, sleep apnea, drug interactions, and head injury. Primary sleep disorders may affect attention and behavior and the symptoms of ADHD may affect sleep.
Several symptoms must be present before age 12 (which is why ADHD is classified as a neurodevelopmental disorder, even if not diagnosed until adulthood). In the Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition (DSM-IV), symptoms were required before age 7.