If a child falls on his head and experiences symptoms such as headache, dizziness, transient loss of consciousness, and a cranial ct is done with no intracranial abnormality, this may lead to a diagnosis of concussion. A concussion is a transient brain dysfunction that occurs immediately after an external blow to the head. It usually manifests itself as a transient loss of consciousness that lasts from a few seconds to a few minutes, usually no more than half an hour, and can be characterized by forgetfulness of recent events, headache, dizziness and other symptoms. After concussion, bed rest is usually required for 5-7 days, and most patients return to normal within two weeks. Avoid excessive fatigue and strenuous head activities, the general prognosis is good. If the child fell on the head is more serious, it is recommended to go to the hospital in time to avoid delay.