There are several possibilities for left-sided posterior headache: first, migraine, migraine can be attacked in the left posterior occipital region, usually distending pain, throbbing pain, feeling deep pain, one attack lasts from several minutes to several hours, sometimes accompanied by blurred vision, nausea, vomiting, etc. Second, occipital neuralgia, this pain site is more limited, usually scalp or subcutaneous pain, with stabbing pain, throbbing pain, the duration is very short, usually neck 2-3 seconds, but can be repeated. Third, myofasciitis, this pain is also confined to the scalp and subcutaneous, but the pain is more diffuse, mainly soreness and swelling. Patients with these conditions need to first improve the cranial CT examination to exclude organic brain disease, and then give symptomatic treatment for pain relief. Non-steroidal antipyretic analgesics such as ibuprofen and naproxen are most commonly used, and gabapentin and pregabalin can also be used for neuralgia, which is a specialized treatment for neuropathic pain.