The back of the head after a fall is a dangerous period within 72 hours, after 72 hours is relatively stable. Because the most fearful thing after a fall is intracranial hemorrhage, the amount of intracranial hemorrhage may be very small at the beginning, and the patient has no symptoms, no uncomfortable feeling. Do CT examination sometimes early did not find, with the passage of time the amount of bleeding gradually increased, hematoma gradually increased, and later will compress the surrounding brain tissue and nerves, the corresponding brain tissue innervates the functional area of the lesion, for example, can appear to walk difficult, speech impediment, and other symptoms, serious time can appear brain hernia affect the respiratory center, endangering the patient’s life. Therefore, in the back of the head after the fall must be medically observed for at least 72 hours, during this period of time, if the patient appears abnormal, should be sent to the hospital in time for CT examination, can be found as early as possible hematoma, to avoid the lesions appear serious situation.