Heavy tongue coating refers to thicker tongue coating. There are many reasons for thick tongue coating, but generally speaking, it suggests that the body’s evil qi is heavier, and the evil qi enters into the body. According to the performance of the tongue, the cause of the disease is also different, generally thick and greasy tongue is mostly seen in the gastrointestinal stagnation and phlegm-dampness in the tongue, the tongue of the yellow greasy and thick visible phlegm-heat or dampness-heat and other evils contained within. 1. Thick and greasy tongue coating: Thick and greasy tongue coating is the result of food stagnation or accumulation of dampness in the stomach and intestines, and the steaming of gastric qi forces the foul and turbid qi upward on the surface of the tongue to form thick and greasy tongue coating. 2. Yellow, greasy and thick tongue coating: mostly suggests dampness and heat in the spleen and stomach (the spleen and stomach feel dampness and heat) or phlegm and heat. Dampness and heat in the spleen and stomach can be seen as stickiness in the mouth, and yellow tongue coating can be seen as a result of dampness and heat, resulting in yellow and greasy tongue coating. Heavy tongue coating may indicate some kind of disease changes within the human body, so you can go to the hospital to have your body examined.