The pain at the back of the head after waking up may have the following causes: first, it is due to poor sleep posture, for example, when sleeping, the back of the head and neck have been in a suspended position, so the muscles are constantly in a state of being pulled, resulting in muscle pain caused by high muscle tension; second, it may be cold when sleeping or the original is cervical spondylosis, resulting in This kind of occipital neuralgia is mainly caused by paroxysmal throbbing pain or pins and needles, electric shock-like pain in the back of the head. Another more serious condition is the possibility of spontaneous intracranial hemorrhage. This condition may also cause pain in the posterior occipital region, especially in subarachnoid hemorrhage. This pain is often severe and persistent.