Half face neuralgia is mainly seen in the following causes: first, trigeminal neuralgia, because the trigeminal nerve is divided into three branches, if all three branches of the trigeminal nerve are violated, it can cause half face pain. From the top of the forehead to the angle of the jaw, the pain of the whole half of the face is a discharge-like or pull-like pain. The pain can be aggravated by stimulation such as brushing the teeth or washing the face. Gapentin or sodium valproate or pregabalin can be administered orally. If the symptom relief is not obvious, nerve block treatment of trigeminal nerve can be given. Second, the cause of pain in half of the face is considered to be odontogenic diseases, such as pulpitis, which can cause neuralgia in half of the face, and then dental X-ray can be done to understand whether there are pathological changes in the alveolar or pulp bone. If it is caused by dental inflammation, anti-inflammatory treatment, such as cephalosporins or metronidazole intravenous drip can be given to relieve the symptoms.