Mouth ulcers caused by deficiency fire are categorized into yin deficiency fire and qi deficiency fire, and patients can take medicines such as Zhi Bai Di Huang Wan, Qing Bone San, and tonifying the middle and benefiting the qi soup symptomatically. Yin deficiency and fire will usually be hot flashes, night sweating (abnormal sweating after going to sleep, waking up sweating stops), dry mouth and throat, five heart heat (two palms and two feet of the heart fever, and consciously feel irritable and stuffy heat in the heart and chest), the tongue is red and no moss and so on, the patient can take Zhi Bai Di Huang Pill, Qing Bone San and other medicines under the guidance of the doctor for treatment, with the effect of nourishing yin and lowering the fire. If there is a deficiency of qi and fire, there will be symptoms such as generalized dryness and heat, fear of cold and wind, tiredness and weakness, spontaneous sweating (involuntary sweating during the daytime, aggravated by sweating with a little movement), and loose urine and stools (thin and unshaped feces), etc., the patient can take Tonify the Middle Jiao Qi Tang to tonify the Middle Jiao Qi (treating deficiency of qi by tonifying the spleen), and to elevate yang and lift the sun (elevating and lifting yang qi of the body in order to lift the sunken organs). If there are any uncomfortable symptoms, the patient can first consult a doctor to identify the disease and then follow the doctor’s instructions for treatment, and if other drugs are taken at the same time, it is necessary to consult a physician first.