The main manifestation of primary trigeminal neuralgia is severe pain in locations including the forehead, eyes, upper and lower alveoli. It can manifest as pain that feels like a flash, cut or electric shock. Primary trigeminal neuralgia is primary pain caused by the absence of tumors or other lesions in the trigeminal nerve area that result in pathological stimulation of the trigeminal nerve fibers. Primary trigeminal neuralgia is clinically characterized by a short duration, usually lasting a few seconds or tens of seconds, while in a few patients the pain is longer and has a sudden onset without warning. Trigeminal neuralgia can be triggered by the slightest touch to sensitive areas such as the patient’s lips, forehead and eyes. Severe cases may cause reflexive twitching of the facial muscles and the corners of the mouth to be pulled toward the affected side due to severe pain. Due to the severe pain, patients are usually afraid to wash their face, brush their teeth and speak for fear of pain, which affects oral hygiene and leads to emotional depression. It is recommended that patients with the above symptoms should go to the hospital in time for relevant examinations to clarify the cause of the disease and receive reasonable treatment under the guidance of the doctor.