Trigeminal neuralgia (TN) is a clinically common cranial nerve disease. It can be easily diagnosed by facial pain, with an incidence of 4 to 27 / 100 000, often occurring in people over 40 years of age, more women than men, more on the right side than on the left side. Its clinical features are: limited to one or more distributed areas of the trigeminal nerve in the head and face, sudden, sudden stop lightning, knife cutting, burning pain can not stand the severe pain, there is a "trigger point", lasts for a few seconds In a few minutes, it can be relieved by itself, making the patient suffer, seriously endangering human health, work and life. Some people call this pain the "first pain in the world". It can be ruled out by head CT, MRI and other tests. Sexual trigeminal neuralgia. Trigeminal neuralgia is an ancient disease. The clinical symptoms are recorded in the Yellow Emperor's Internal Classics about 2,000 years ago. Foreign countries also recorded the description of trigeminal neuralgia in the 1st century AD, and it was defined in 1773. The clinical features of trigeminal neuralgia. At present, the reasons for its occurrence are not clear, mainly local stimulation theory, local oppression theory, central etiology theory, allergy theory, viral infection theory, family genetic theory, comprehensive etiology theory. Generally not caused by the state of food.