Chinese medicine believes that thick white tongue coating is mostly related to dietary stagnation, spleen and stomach deficiency (spleen and stomach weakness and cold), excessive dampness and other factors. 1. Dietary stagnation: Dietary stagnation may occur if the patient has a poor diet and a weak spleen and stomach. The accumulation of food in the body will hinder the normal transportation of water and liquids and qi, thus causing the manifestation of thick white tongue moss. 2. Weakness of the spleen and stomach: If the patient has a weak spleen and stomach and insufficient spleen yang, he/she is unable to putrefy (initially digest the food and form food waste) the water and grains, which leads to the abnormal operation of the water and liquid, and overflows on the tongue, thus resulting in the appearance of thick white tongue moss. 3. Excessive dampness: If the patient is cold or in a humid environment for a long time, the phenomenon of excessive dampness will occur, and due to excessive dampness will lead to a large amount of water and moisture stagnation in the body, resulting in the appearance of the phenomenon of thick white tongue moss. Patients with thick white tongue, it is recommended to go to a regular hospital, under the guidance of a professional physician to identify the treatment.