Oral fire is a common clinical symptom, mainly manifested as oral mucosa, tongue surface appear single or multiple yellowish-white ulcerated spots of varying sizes, burning pain, and recurrent episodes. Belongs to the Chinese medicine “mouth sores” category, may be due to the heart and spleen heat, Yin deficiency fire (body Yin essence deficit, the emergence of hyperactive fire) and spleen and kidney Yang deficiency (spleen and kidney Yang deficiency). Overeating spicy stimulation and fat, sweet, thick and greasy, resulting in heat accumulation in the heart and spleen, the heat is transformed into fire, the inflammation in the oral cavity through the channels, can be seen mouth sores. Mouth sores can also be seen when there is a deficiency of yin after a long period of illness, or when there is an over-exertion of labor and injury, resulting in a loss of yin and fluid, and a deficiency of fire that is inflamed in the oral cavity. There is also Yang deficiency of the spleen and kidneys, which can lead to mouth sores. Mouth sores, can be taken to identify the cow yellow detoxification pills, Huanglian stomach pills, etc., but the above drugs with bitter cold, easy to hurt the spleen and stomach, so the spleen is weak and loose stools should be used with caution, it is recommended that under the guidance of a professional physician to identify the evidence to take.