A thin tongue with red tongue coating may be caused by heavy internal heat, kidney yin deficiency, blood stasis, etc. It can be treated by improving diet, taking nourishing yin and tonifying kidney drugs, and activating blood circulation and removing blood stasis (promoting blood circulation and eliminating blood stasis in the body) drugs. 1. Heavy internal fire: If the patient likes to eat spicy and stimulating food for a long time and is overworked, it may lead to the phenomenon of heavy internal fire, resulting in the symptom of a thin tongue with red fur. The patient can be relieved by improving the diet, mainly light, eat more fresh vegetables and fruits, drink more water to avoid dehydration. 2. Kidney yin deficiency: Patients with kidney yin deficiency will have symptoms such as thin tongue, red tongue coating and dry cracks, which can be treated by taking oral nourishing yin and tonifying the kidney drugs, such as Liufidihuang Pill and Zhibaidihuang Pill, etc. Patients with hypertension, heart disease, etc. should be treated by taking oral nourishing yin and tonifying the kidney drugs. Patients with high blood pressure and heart disease need to use them under the guidance of a doctor. 3. Blood stasis: A thin tongue with red tongue coating may indicate that there is blood stasis in the body, which can be treated with oral medications that activate blood circulation and eliminate blood stasis, such as Shuji Yuzhiweiqi (舒筋活血片). The adverse effects of the above drugs are not clear, allergic to drug ingredients, pregnant women and other people are prohibited. Patients with high blood pressure, heart disease, etc. should be used under the guidance of a doctor. When the patient appears the symptoms of tongue thin small tongue red, it is recommended to consult a doctor in time, identify the cause of the disease and follow the doctor’s instructions for medication, do not use medication, so as not to delay the condition.