”Trigeminal neuralgia, sometimes called “face pain”, is a kind of recurrent paroxysmal severe neuralgia in the distribution area of the facial trigeminal nerve, which is one of the common diseases in neurosurgery and is also one of the internationally recognized difficult diseases. Most trigeminal neuralgia starts at the age of 40, mostly in middle-aged and elderly people, especially in women, and its onset is more on the right side than on the left side. The disease is characterized by sudden onset, stopping, lightning-like, cutting, burning, intractable and severe pain in the trigeminal nerve distribution area of the head and face. Patients with trigeminal neuralgia often do not dare to wipe their faces, eat, or even swallow saliva, thus affecting their normal life and work. Some people call this pain “the first pain in the world”. Adverse reactions and complications 1. Pain during operation: This method requires the cooperation of the patient. Before treatment, it should be clearly explained that such treatment under local anesthesia is painful, so the patient’s understanding and cooperation must be obtained, and attention should be paid to slow heating from 60℃, which can reduce the pain caused by sudden high temperature. 2, intracranial hemorrhage: the medial aspect of the semilunar ganglion is adjacent to the cavernous sinus and the internal carotid artery, so inadvertent puncture or entering the foramen ovale too deeply can easily damage and bleed, and in serious cases, intracranial hematoma can be formed. 3, brain nerve damage: such as facial light paralysis, etc. 4, intracranial infection: strict aseptic operation can prevent secondary intracranial infection. Special attention should be paid to prevent repeated punctures of the buccal mucosa by the puncture needle to bring bacteria from the oral cavity into the skull. 5. Herpes zoster: It can appear in the affected area several days after surgery, and its mechanism is not clear. Local nail violet or cortisone ointment can be applied and heal in a few days. 6, keratitis: one of the more serious complications of hemianoplasty is the loss of corneal reflexes, which can cause paralytic keratitis in severe cases, and can eventually lead to blindness. During the operation, it is important to control the heating temperature and time, and to check the change of corneal reflex at any time. In cases where loss of corneal reflex has occurred, the patient should be instructed to wear glasses and use eye ointment to protect the cornea and prevent keratitis. Some corneal reflex loss takes several months to gradually recover. 7. Facial sensory disorders: Most patients can have different degrees of facial sensory disorders after treatment.