Persistent neuralgia on the left side of the head may be caused by physiological causes, pathological causes such as migraine, trigeminal neuralgia, cerebrovascular disease and other factors. 1. Physiological reasons: if you stay up late for a long time, overwork, emotional excitement, etc., it will easily lead to sleep deprivation, and the situation of persistent neuralgia on the left side of the head. 2. Pathological causes (1) Migraine: persistent neuralgia on the left side of the head may also be caused by migraine, which is mainly caused by vascular dysfunction. (2) Trigeminal neuralgia: when the trigeminal nerve is damaged or pinched, it may also lead to the symptom of persistent neuralgia on the left side of the head. (3) Cerebrovascular disease: when patients suffer from cerebral hemorrhage, brain tumors and other diseases, they may have the condition of persistent neuralgia in the left side of the head. Patients with persistent neuralgia in the left side of the head should go to the hospital in time to clarify the cause and get proper treatment under the guidance of the doctor.