The pain on one side of the head needs to be considered in four aspects: 1. vascular neuropathic headache, mostly seen after herpes zoster, otitis media, drinking, cold and flu. 2. migraine headache, which is characterized by recurrent attacks, often accompanied by fear of light and noise, and can be relieved by sleeping or temporarily taking painkillers after each attack. 3. occipital neuralgia caused by poor cervical spine, which can be identified by MRI of the cervical spine. 4. cerebrovascular disease, such as cerebral infarction, cerebral hemorrhage, can go to the hospital to check the CT scan of the head to determine the diagnosis. Therefore, it is necessary to go to the hospital in a timely manner to do relevant examinations to determine the cause of headache, and then to formulate corresponding treatment measures according to the cause.