A headache on the top of the head after hitting the back of the head may be caused by concussion, cerebral contusion, cerebral hemorrhage and so on. 1. Concussion: If the impact on the back of the head leads to a brief loss of consciousness, after the recovery of consciousness, the injury at that time and the recent situation before the injury can not be remembered, but also headache, dizziness, fatigue and weakness and other symptoms to consider the possibility of concussion. 2. Cerebral contusion: The primary organic brain injury caused by violence to the head can occur both in the brain tissue at the point of impact and at the impact site. Therefore, hitting the back of the head can lead to symptoms of pain at the top of the head. 3. Cerebral hemorrhage: If cerebral hemorrhage occurs after hitting the back of the head, due to the increase of cranial pressure, it can be manifested as pain in the top of the head or the whole brain, accompanied by weakness of the lateral limbs and other symptoms. When the patient appears to hit the back of the head headache, should go to the hospital in time for consultation, and actively cooperate with the doctor for treatment.