Mouth ulcers belong to the category of mouth sores in Chinese medicine, mouth sores may be deficiency fire or solid fire. Mouth ulcers are mainly caused by disorders of the heart, spleen and kidneys. Upper focal solid heat for the heart and spleen heat, lower focal yin fire is the kidney deficiency yin deficiency fire (Yin essence loss in the body, the emergence of hyperactive fire), the middle focal deficiency for the spleen and kidney yang deficiency (spleen and kidney yang qi deficiency), so there may be a real fire, but also may be a false fire. 1. Accumulated heat in the heart and spleen: the mouth is the orifice of the spleen and the tongue is the seedling of the heart. If dietary disorders, or emotional disorders, visceral internal heat, heart and spleen heat, inflammation of the oral cavity, hair for mouth sores. 2. Yin deficiency and fire: Yin deficiency in the body, or loss of nourishment after illness, or overwork, stay up late and think a lot, yin liquid dark consumption, yin deficiency and fire, inflammation of the fire, hair for mouth sores. 3. Spleen and kidney yang deficiency: physical yang deficiency, or prolonged illness yin damage and yang, or greed for cold and cold, or typhoid fever (feel the cold evil disease caused by fever) mis-treatment, damage to the spleen and kidney yang, clear yang is not ascending (light and clear yang can not be up), turbid yin on a thousand, cold and dampness trapped in the mouth for mouth sores. If the above manifestations occur, it is recommended to go to the hospital in a timely manner, under the guidance of the doctor for treatment.