Pain on the left side of the head can be seen in the left trigeminal neuralgia ophthalmic branch, in patients with paranasal sinusitis and frontal sinusitis, as well as in left-sided brain tumors and left-sided cerebrovascular diseases, such as cerebral hemorrhage and cerebral infarction, which can be clearly diagnosed by cranial CT examination. In addition, it can also be seen in migraine. Migraine is a primary headache, a recurrent headache disorder in which patients often have pain on one or both sides, often accompanied by nausea and vomiting, and in a few cases preceded by aura of visual, sensory and motor disturbances. The cause of the patient is generally unclear, with most being related to genetic, dietary, endocrine, and psychiatric factors. Patients have triggers for seizures, including weather changes, stress, anxiety, sleep disturbances, light stimulation, and certain foods, which can trigger them. It is recommended to consult a neurologist to improve the CT or MRI of the head and treat according to the cause.