Headaches are one of the most common symptoms that people experience during the week, and they are often difficult to get rid of because of the nagging and resulting distractions. How is it caused? Headache is often caused by abnormal pain sensation in the head, neck and facial nerves that are stimulated and then transmitted to the brain. It can be caused by intracranial lesions, head and neck lesions, somatic diseases other than head and neck, neurosis and psychosis. However, primary occupational diseases, including tumors, cerebrovascular diseases, especially subarachnoid hemorrhage, must be excluded. The doctor makes a comprehensive judgment, however, by understanding from the patient the cause, course, time of occurrence, location, nature, degree and reasons for aggravation and reduction of the headache. According to the clinical characteristics: superficial pinprick-like sharp pain is mostly cranial surface neuralgia; throbbing pain or distension on one side is vascular pain; constricting pain in the cervical-occipital region and the top of the forehead; episodic headache induced by head position and body position change is often caused by low intracranial pressure syndrome, transient ischemic attack, “cervical” migraine, hypotension, ventricular system mass, etc. The headache can be caused by hypertension, early intracranial pressure, cardiac insufficiency, prefrontal sinusitis and epilepsy; the headache caused by migraine, cluster headache, epilepsy and hysteria is related to emotion and exertion; the headache is accompanied by symptoms: if the headache is accompanied by vomiting, attention should be paid to the presence of intracranial lesions, migraine, glaucoma, epilepsy, cluster headache, etc. If the headache is accompanied by vomiting, we should pay attention to the presence of intracranial lesions, migraine, glaucoma, epilepsy, cluster headache, etc. The five senses and oral lesions are often accompanied by lacrimation, nasal obstruction, epistaxis, runny nose, loss of vision and other symptoms. Especially for those who do not have the first attack, the doctor asks the patient to do some necessary tests. For example, CT examination of the head and neck to understand whether there are intracerebral occupying lesions and ventricular system enlargement; EEG examination to understand whether there are abnormal brain waves; lumbar puncture to understand intracranial pressure, cerebrospinal fluid cytology, biochemistry and parasitic antibodies; X-ray paranasal sinus radiograph to understand whether there is sinusitis and check whether there is elevated intraocular pressure; cervical spine plain film to understand the cervical spine situation, etc.