First, migraine is considered to be a migraine, the clinical cause of migraine is not very clear, and it is considered to be related to metabolic factors, endocrine factors and environmental factors, etc. It is mostly seen in young and middle-aged patients, and it can appear after poor rest and stressful exertion. Treatment can be given to symptomatic pain medication orally, clinically commonly used are ibuprofen, or acetaminophen, in severe cases can also consider oral painkillers and ergotamine preparations. Second, the left side of the head pain can also be seen in cerebrovascular disease, with cerebral hemorrhage is more common. Generally, there is a history of hypertension, the symptoms appear more rapidly and suddenly, and can be accompanied by symptoms of neurological deficits, such as numbness and weakness of the limbs, clumsiness of speech, etc. The diagnosis can be confirmed by CT examination of the head. Treatment can be surgical or conservative depending on the amount of bleeding. Third, the left headache can also be seen in patients with sinusitis or otitis media, in addition to the left side of the headache, it can also be accompanied by nasal congestion, runny nose, ear pain symptoms, if necessary, it is recommended to consult the Department of Five Ophthalmology.