Initial symptoms of trigeminal neuralgia include sudden severe pain, site-specific pain, facial twitching and other symptoms. 1. Sudden severe pain: there is no symptom before the onset of pain, and the pain is often sudden, brief, lightning-like and intense, and the duration of each attack is from the first few seconds to a few minutes after the sudden stop. 2. Pain in specific areas: more on the right side than on the left side, the pain spreads to one or more branches of the trigeminal nerve from a certain point of the face and mouth, with the second and third branches being the most common, and the first branch being the least common. Paroxysmal severe pain in the distribution area of the trigeminal nerve in the face, lasting from a few seconds to 1 or 2 minutes, with the same pain condition every time. 3. Facial twitching: about 60% of patients with pain episodes accompanied by the same side of the eye or both eyes tearing and drooling, or facial expression muscles appear uncontrollable twitching, known as painful twitching. Some of them have redness, heat, accompanied by coldness of the skin, and occasionally there are people with severe itching. If trigeminal neuralgia occurs, you should go to the relevant hospital in time to receive regular treatment, and strive for early diagnosis and timely treatment.