The specific symptoms of mandibular nerve injury are as follows: 1, when the patient occurs when the mandibular nerve injury, the first will be manifested as severe pain, the nature of the pain is knife-like or tear-like, resulting in the patient is difficult to tolerate. Some patients have long-term, recurrent pain, and even physical and mental diseases; 2, some patients with mandibular nerve injury will appear in the area of the mandibular nerve root distribution obvious trigger points, manifested around the corners of the mouth, both sides of the nose, once touching the trigger point will trigger a pain attack, in daily life, such as brushing teeth, washing face, loud talking, crying and laughing, and even yawning actions, may be able to induce pain. In addition, pain attacks may also be triggered by exertion, fatigue, and when one is cold or chilled in daily life.