Trigeminal neuralgia refers to pain in the distribution area of the trigeminal nerve limited to one side of the face, with pain in the distribution area of the II and III branches of the nerve, such as pain in the upper lip, nose, corners of the mouth, incisors and mucous membrane of the cheeks, etc. It is most common. The pain is sudden lightning-like attacks, such as knife-like, electric shock-like and tearing pain, and the attacks are very painful. The painful area often has a trigger point to trigger the pain, and the pain can be triggered by actions such as washing the face, brushing the teeth, talking and eating. Patients are often afraid to eat, drink, or talk, which seriously affects their quality of life! At present, due to its unique clinical manifestations, there is no difficulty in confirming the diagnosis. The clinical symptoms are as follows: 1. The pain is brief, repetitive and severe. Patients often describe the pain as lightning-like, electric burning, pins and needles, knife-like or tearing pain, and use a characteristic-like action – the sudden opening of a clenched fist – to show the onset and expansion of pain. 2. The pain is limited ① Mostly one-sided, and the right side is more common. The pain mostly starts from a certain branch and can gradually spread to two or three branches. Single branch pain is most common in the third branch, followed by the second branch, and least common in the first branch. The second and third branches are the most common when both branches have pain at the same time. A few people with pain on both sides of the face have one side first, or the pain is heavier on one side, and after the pain disappears with treatment, the opposite side is then aggravated. 3, pain often has “trigger points” that in the affected side of the trigeminal nerve distribution area, such as the lips, corner of the mouth, nose, cheek, teeth, gums, front of the tongue and other parts are particularly sensitive, the slightest touch will cause pain, these sensitive areas are called “trigger points”. 4. Pain attacks are often unpredictable and come on suddenly. There are no symptoms in the interval. It can occur without any obvious trigger, but it is often triggered by non-painful touch, such as chewing, yawning, talking (the third branch), washing face, brushing teeth, touching (the second branch), combing hair (the first branch), or even a breeze to the face. Therefore, many patients are afraid to wash their faces, brush their teeth, and eat because of this, resulting in extremely poor oral and facial hygiene status, general malnutrition, local skin roughness, and even local muscle atrophy. Some patients stay in a certain position for fear of triggering pain. 5. The course of the disease can be cyclical. Each attack lasts for several days, weeks or months, and the remission period is several days or years. The longer the course of the disease, the more frequent the attacks, the more severe the disease, and generally does not heal on its own. Neurological examination usually has no positive signs. 6.Narcotic painkillers are often ineffective in relieving pain. Patients are rarely addicted to narcotics, but often cannot tolerate pain and want to commit suicide. 7.In addition to severe pain, trigeminal neuralgia can also be accompanied by facial flushing, conjunctival congestion, lacrimation and birth. 8.The pain of trigeminal neuralgia often occurs during the day and rarely occurs at night. This can be distinguished from odontogenic pain.