A nervous teeth tightness causes include physiological factors such as emotional factors, mental illness, epilepsy and so on. 1. Physiological factors: when the patient is emotionally excited, the sympathetic nerve is excited, this time will consciously have the symptom of tight teeth. When the mood relaxes, it will return to normal after rest. 2. Mental illnesses: anxiety disorders can also occur when a nervousness tight teeth. When suffering from schizophrenia, there may also be a nervousness and self-consciousness of tight teeth symptoms. 3. Epilepsy: if the patient has a history of epilepsy, when the tension may trigger a seizure, then the patient will be self-conscious of the tightening of the teeth, combined with the electroencephalogram and other tests can be diagnosed. If the person is not considered to be caused by physiological factors such as nervousness, it is recommended to seek medical attention.