The causes of pain on the left side of the patient’s head are as follows: 1. It may be caused by muscle and fascia pain, mainly distension and soreness in clinical practice, mostly caused by poor posture or neck muscles in a tense state, resulting in the head muscles being stretched. 2. If the patient has pain on the left side of the head, if it often recurs and presents throbbing and throbbing pain, it is considered to be caused by migraine, which can be 3. The pain on the left side of the patient’s head may also be caused by occipital neuralgia, or auricular neuralgia, supraorbital neuralgia and other diseases. If the patient’s pain is lightning-like or seizure-like in nature, it should be considered as neuralgia.