Burning mouth syndrome is not uncommon in clinical practice. It is a group of syndromes with burning and tingling sensation in the tongue as the main manifestation, also known as lingualgia, abnormal tongue sensation and abnormal oral mucosal sensation. The disease mostly occurs at the root of the tongue, followed by the edge of the tongue, the back of the tongue and the tip of the tongue, and other parts such as the cheek, lip, palate and pharynx can also develop. During the onset of the disease, the symptoms of tongue pain show a rhythmical change of light in the morning and heavy in the evening, and are aggravated when talking too much, eating dry food and resting at leisure, but when distracted by work, eating, sleeping and eating, the pain usually does not increase but decreases or even disappears. Because the symptoms are burning and stabbing pains, which are different from general pains, a considerable number of patients come to the clinic with “cancer-phobia” after having symptoms, which brings great inconvenience and pressure to their work and life. Patients with burning mouth syndrome often consult the doctor with tongue pain and burning sensation, but medical personnel often do not see any signs of local damage in the clinic, thus making accurate diagnosis difficult and easily causing misdiagnosis and delaying the time of treatment.