ADHD, also known as attention deficit syndrome or mild brain injury syndrome, is generally believed to be due to mild brain injury before infancy and childhood, hyperactivity is actually caused by inattention, so treatment with medication is generally to increase the excitability of the cerebral cortex to achieve is the purpose of improving attention. Ritalin can be tried, generally 10mg daily, normal treatment dose generally no major side effects, will not affect the intellectual development. If left untreated, its ADHD symptoms affect not only others, but importantly, the normal developmental formation of a healthy personality of the affected child.