Trigeminal neuralgia facial swelling may be caused by intracranial tumor or nasopharyngeal cancer, trauma and other reasons. 1. Intracranial tumor: when infected by virus or exposed to carcinogenic compounds, it can cause intracranial tumor disease. As the tumor grows, it will cause pressure on the surrounding nerves and brain tissues, affecting the nerve function and blood circulation, and causing the patient to suffer from trigeminal neuralgia and facial swelling and other symptoms. 2. Nasopharyngeal cancer: Under the influence of hereditary and environmental factors, nasopharyngeal cancer may cause patients to develop nasopharyngeal cancer. When the cancer cells keep spreading and metastasizing to the surrounding area, they may invade the base of the skull, leading to the damage of brain function and nerves, and then the above symptoms may also appear. 3. Trauma: facial swelling of trigeminal neuralgia may also be caused by head trauma and trauma to facial trigeminal nerve travel area. It is recommended that patients go to the hospital in time to determine the cause of the disease, and treat the symptoms under the guidance of the doctor.