Symptoms of nerve pain on the left side of the head: 1. If the symptoms appear occasionally, they may be related to emotional excitement, lack of sleep at night, and overexertion. 2. If there are symptoms of runny nose and sneezing, they may be related to not paying attention to keeping warm when going out, wind and cold invasion, catching cold, or catching a cold. 3. If there are symptoms such as black spots and flashes in front of the eyes before the headache, it may be related to migraine. . 4. Suffering from cerebrovascular diseases, such as cerebral arteriosclerosis, cerebral infarction, cerebral thrombosis, cerebral hemorrhage, brain tumor, etc., may also lead to left-sided headache. However, patients often have a history of hypertension, hyperlipidemia, diabetes, and may be accompanied by weakness, numbness, nausea and vomiting of one side of the limb. Therefore, if this symptom occurs occasionally, you can choose to apply some pain-relieving drugs, such as ibuprofen, for treatment. However, if the headache occurs on one side for a long time, it is recommended that it is better to go to the neurology department of the hospital to clarify the specific cause through head CT or magnetic resonance examination, and then actively treat the cause after determining the cause.