The causes of headache include physiological and pathological causes. 1. Physiological causes: excessive fatigue, lack of sleep, mental tension, excessive pressure and other physiological factors can cause headaches. 2. Pathologic causes include primary and secondary causes. (1) Primary headache Migraine: common in middle-aged and old women and adolescents. Migraine is a common primary headache, characterized by episodic, mostly lateral, moderate to severe, throbbing headache, usually lasting 4-72 hours, accompanied by nausea, vomiting, and aggravated by sound, light stimulation or daily activities. Tension-type headache, also known as neurological headache, is common in young and middle-aged people with unknown causes or nerve stimulation, bilateral occipital or whole head tightness or pressure headache, accounting for about 40% of headache patients, the most common type of primary headache. Cluster headache: the onset of one side of the headache, and accompanied by bursting pain around the eyes, accompanied by eyelid ptosis and other symptoms. (2) Secondary headache: craniocerebral trauma and neck trauma; secondary intracranial and extracranial vascular disease; infectious headache such as encephalitis, meningitis, respiratory infection; pseudotumor cerebri syndrome; low cranial pressure headache; high cranial pressure headache and intracranial space-occupying lesions; metabolic diseases; diseases of the eyes, ears, larynx, and nose; and headache of psychogenic origin. There are many causes of headache, it is recommended that patients go to the hospital for formal diagnosis and treatment in a timely manner, so as not to delay the condition.