Headaches are one of the most common symptoms that people have in general, and they are often difficult to get rid of, resulting in distraction. What causes it? 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 physician makes a comprehensive judgment, however, by understanding from the patient the cause, course, time of occurrence, location, nature, degree, and causes of aggravation and relief of the headache. Clinical features: superficial sharp pinprick-like pain is mostly cranial neuralgia; throbbing pain or swelling pain 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, often caused by low intracranial pressure syndrome, transient ischemic attack, “cervical” migraine, hypotension, ventricular system masses, etc. Morning or nocturnal attacks can be caused by hypertension, early intracranial pressure, cardiac insufficiency, prefrontal sinusitis and epilepsy; migraine, cluster headache, epilepsy and hysteria are related to emotions and exertion; transient attacks of sharp pain after cold or injury are mostly neuralgia; symptoms accompanying headache: if headache is accompanied by vomiting, attention should be paid to the presence of intracranial lesions, migraine, glaucoma, epilepsy, and epilepsy. 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 symptoms such as lacrimation, nasal obstruction, epistaxis, runny nose, loss of vision, etc.; we should also understand the physical diseases other than head and neck. Especially for non-first-time patients, doctors ask patients 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, check whether there is elevated intraocular pressure; cervical spine plain film to understand the cervical spine situation, etc.