The symptoms of trigeminal neuralgia are mainly severe pain in the trigeminal nerve distribution area. The trigeminal nerve distribution area refers to the frontal, facial and oral areas, specifically including the forehead, arch of the eyebrows, orbits, nasal cavity, paranasal, upper lip, cheeks and cheekbones, lower lip, jaw, preauricular, external auditory canal and temporal skin; as well as the oral mucosa, palate, tongue, upper alveolar, lower alveolar and root areas of the teeth. The nature of pain can be described as lightning or electric shock-like, knife-like, fire and needle-like severe pain; the duration of pain, often ranging from a few seconds to a few minutes, is significantly prolonged in patients with advanced pain, which can reach half an hour to several hours; the pattern of pain is sudden and abrupt, with the attack stopping period as normal, and the number of pain episodes varying from several times to dozens of times per day, with the skin of the upper lip, paranasal, lower lip and jaw and There are “trigger points” in the oral mucosa, tongue, upper and lower teeth, etc. Touching or pressing this “trigger point” can trigger a severe pain attack. Therefore, patients are afraid to speak loudly, and the pain can recur when they eat, wash their faces, brush their teeth, or when the breeze hits their faces. Patients with similar pain that can be relieved by the drug carbamazepine are diagnosed with “trigeminal neuralgia”.