1, severe pain: the most typical symptom of trigeminal neuralgia is severe pain, there is no sign before the attack, and the pain is mostly tearing, lightning-like, knife-like, burning-like, often suffer from trigeminal neuralgia patients once the pain feels unbearable. 2, pain time is short: facial trigeminal nerve distribution area belongs to the paroxysmal severe pain, lasting a few seconds to 1-2 minutes, each time the pain situation is the same. The pain is periodic, and the interval between attacks is the same as normal. The most common site is the second branch of the trigeminal nerve, which is combined with the third branch of the trigeminal nerve, accounting for more than 95% of patients with trigeminal neuralgia. In addition, the third branch alone is also a frequent site of pain. Bilateral pain is rare, with one side being lighter than the other. 4, pain with other symptoms: The symptoms of trigeminal neuralgia, in addition to pain, will be accompanied by vascular-vegetative symptoms, the main manifestation of which is ipsilateral or bilateral eye lacrimation or drooling, sweating, pupil enlargement, skin swelling or temperature increase, etc. 5, “trigger point” trigger pain: pain can be caused by the movement of the mouth, tongue or external stimulation, pain when touched, mostly in the lips, nose, eyebrows and mouth, etc. For fear of causing attacks, patients often do not wash their faces, less food and drink, resulting in facial dirt, wasting, severe cases of physical weakness, bedridden. Talking, washing face, brushing teeth or breeze, even walking will lead to severe pain when paroxysmal. 6. Periodic attacks: Trigeminal neuralgia pain has periodic attacks, with the same intervals as normal. The painless period is gradually shorter, gradually affecting the patient to eat and rest, so that the pain is unbearable, self-healing is relatively rare. 7. Facial changes: The patient’s affected half of the face can be spasmodically distorted during the pain attack, and after the attack is terminated, sometimes the affected face is first white, then flushed, and the conjunctiva is congested, accompanied by lacrimation, runny nose, salivation and so on. Sometimes the so-called trigeminal and facial spastic painful convulsions and vegetative neurosis are present.