The back of the tongue generally refers to the root of the tongue, the root of the tongue belongs to the kidneys, the back of the tongue thick white tongue coating may be due to phlegm-dampness stagnation, accumulation of food (food indigestion and accumulation in the stomach) and other reasons. 1. Phlegm-dampness stagnation: it is often manifested as obesity, chest tightness, nausea, dizziness, little food, slippery pulse, etc. It is recommended that the patient’s diet should be light. It is recommended that the patient’s diet should be light, strengthen physical exercise, can be taken under the guidance of the physician warm gallbladder soup, Er Chen Tang and so on. 2. Food accumulation (indigestion of food and its accumulation in the stomach): patients often manifest abdominal distension, abdominal pain, vomiting, diarrhea, farting, inappetence, and slippery pulse. Baohe Pills and Hovenia Conducting Pills can be taken under the guidance of a physician. It is recommended that patients should consult a medical professional before taking medication, and should not take medication on their own. If symptoms such as thick white tongue coating occur, please seek medical advice if necessary.