Oral fire is a relatively common oral problem. Oral fire brings pain to people and seriously affects the daily life of patients. It usually manifests as ulcers, burning pain in the mucous membrane, etc. Improper diet, immune problems, tumor problems, and emotional factors are all common clinical causes of oral fire. First of all, improper diet is the most common cause of oral fire in clinical practice. People with oral fire usually like to eat some barbecue, fried and other spicy, stimulating food. The lack of vitamin B in the usual diet leads to the problem of oral fire. It is recommended that such patients must pay attention to adjust the diet structure and eat more fresh fruits and vegetables, which can help relieve the oral fire. Secondly, for some patients with recurrent oral fire, the cause of the disease is mainly related to their own immune factors. Some patients with immune deficiencies are prone to suffer from oral fire. Research shows that oral fire is also a typical clinical manifestation of malignant tumors. If a patient has a single oral ulcer that does not heal for a long time (usually more than 2 weeks), he must go to the oral and maxillofacial surgery department for relevant cancer screening. Finally, emotional factors can also cause the occurrence of oral fire. The usual work stress and over fatigue cause endocrine imbalance, leading to the appearance of mouth ulcers. In addition, swollen and painful gums are sometimes considered as oral fire, but in fact, swollen and painful gums are often caused by the irritation of dental calculus, which should be promptly checked and treated by dentistry. Once a patient has a fire in the mouth, it is important to actively identify the cause of the fire in the mouth. Active treatment and lifestyle adjustments to address the cause can help alleviate the condition.