Sudden onset of pain on the left side of the head should first be ruled out as caused by intracranial organic lesions, mainly seen in cerebrovascular disease, such as cerebral hemorrhage patients should be examined by cranial MRI or cranial CT to clarify the diagnosis. If the blood pressure is too high, the patient may also experience the above-mentioned condition and the blood pressure should be monitored. Patients with migraine mainly have recurrent one-sided throbbing headache; nausea and vomiting may occur; headache symptoms may appear suddenly. Most patients have a trigger for the headache. Common triggers include weather changes, anxiety, depression and crying, and may be triggered by certain foods or fruits. In the case of cluster headache, the headache is usually severe, mostly manifesting as persistent swelling, pulling and tearing pain in one orbit, periorbital area or frontal or temporal area, and the headache may be accompanied by conjunctival congestion, nasal congestion and tearing.