The symptoms of trigeminal neuralgia are mainly manifested in the following aspects: (a) Nature of pain: The common symptoms of trigeminal neuralgia often occur without aura, and manifest as sudden onset of tearing, electrocution, burning, cutting or fracture-like pain in the area of the affected nerve distribution, which is unbearable and painful for the patient. (2) Pain site: The common symptoms of trigeminal neuralgia start from one branch of the trigeminal nerve, and then gradually expand. (3) Time limit and periodicity of pain attacks: those with frequent attacks of trigeminal neuralgia often feel the pain lasts for several hours or all day. And this frequent attack can suddenly relieve itself after weeks or months, without any pain during the remission period, and then it can recur after a period of time. (4) Trigger points and triggering factors of pain: The common symptoms of trigeminal neuralgia include one or more special sensitive skin areas within the distribution of the trigeminal nerve, which can cause painful attacks whenever they are slightly touched, called “trigger points”, the scope of which is relatively limited, concentrated in the nasal area, upper and lower lips, upper and lower gums, cheeks, eyebrows, etc. (E) Pain associated symptoms and signs: The common symptoms of trigeminal neuralgia may be accompanied by vascular-vegetative symptoms, such as redness of the affected side, sweating, dilated pupils, lacrimation, congestion of nasal mucosa, runny nose, increased saliva distribution, increased skin temperature and swelling.