The main cause of trigeminal neuralgia behind the ear is the compression of the trigeminal nerve by blood vessels in the brain, and it is most common in middle-aged and elderly people. In a very small number of patients, it is caused by lesions in the brainstem. The trigeminal nerve has three branches: the first is the ophthalmic branch, the second is the maxillary branch, and the third is the mandibular branch. Commonly, trigeminal nerve pain behind the ear is caused by the second maxillary branch and the third mandibular branch. There are mainly the following causes: First, the nerve is compressed by cerebral vascular sclerosis. Second, thickening of the meninges and narrowing of the bone foramen, which causes compression when the nerve passes through. Third, compression by tumors in the skull. Fourth, the trigeminal nerve infection inflammation. Fifth, the blood vessels become deformed for unknown reasons. In addition, it may also be caused by personal habits. First, excessive nervous tension. Prolonged excessive nervous tension is not only harmful to the brain nerves but also to the body. Second, the rest time is not enough, the quality is not high. Rest time and health has a great relationship, usually have enough sleep time. Third, excessive smoking and alcohol. Smoke and alcohol to a small amount, excessive will affect the health. Fourth, cold and cold. Cold and flu can cause inflammation and lead to trigeminal nerve pain. Finally, once the occurrence of episodic pain in any part of the face, like an electric shock, burning-like pain, may be trigeminal neuralgia, must go to the regular tertiary care hospital for treatment, drugs can effectively reduce the pain, drug treatment is ineffective when surgery can completely cure trigeminal neuralgia.