The patient should have a cranial CT as soon as possible after the head injury, and also review the cranial CT several times. generally, when the head is injured, especially when it is hit, in order to understand the condition of the injured person at the first time, it is necessary to have a cranial CT examination at the neurosurgery clinic of the local public hospital above the second level as soon as possible, and this time try to have the cranial CT examination within 6 hours after the injury. If the first CT is not sure that there is a problem, but only suspected, it should be rechecked again after 6 hours. If the first CT is not problematic and the patient does have significant symptoms, it should also be repeated 6 hours later. If a problem is found, the third review should not be done until 24 hours after the injury.