If a patient has a sudden onset of headache, eye pain and nausea on the left side, it is recommended to consult a hospital, especially for middle-aged and elderly people who have arteriosclerosis, which can cause sudden onset of cerebrovascular diseases, such as cerebral hemorrhage, resulting in headache, eye pain and nausea on the left side, and if necessary, it is recommended to consult a neurologist for appropriate treatment. If a patient has recurrent headache, eye pain and nausea on the left side, it is most likely to be a migraine, and the patient usually has a history of migraine. When there is a trigger, migraine attacks can be accompanied by migraine headache on the left side, eye pain, nausea, photophobia and fear of sound when the pain is severe. If necessary, the patient may be given oral medications to relieve the migraine, such as acetaminophen and ibuprofen. If the pain is severe, the patient can also take oral ergotamine or treprostin, and acupuncture and massage can be given to improve the headache. If necessary, patients are advised to consult an ophthalmologist to rule out headaches caused by increased eye pressure such as glaucoma.