Mouth ulcers belong to the category of traditional Chinese medicine “mouth sores”, and lung heat has a certain relationship, but not all mouth sores are related to lung heat, in the clinical need for evidence-based treatment. If the wind-heat evil causes solid heat in the lungs, the heat will vaporize the mouth, and mouth sores may appear, manifesting as sores in the mouth, redness, swelling, blisters, and pain, as well as symptoms such as cough, fever, and sore throat. In addition, if the lung and kidney yin deficiency, false heat within the birth of false fire burning in the oral cavity can also be issued for mouth sores, can be manifested as the number of mouth ulcers is not very much, redness, swelling, pain is light, but this is more and more, more than the prolonged, dry mouth and tongue do not want to drink and other symptoms. Mouth sores and lung heat related, but Chinese medicine symptoms are not exactly the same, therefore, it is recommended that the discomfort need to consult a doctor in a timely manner, under the guidance of Chinese medicine practitioners to identify and treat the medication, do not take their own medication.