Black tongue coating should be alert to liver lesions and excessive liver fire; I suggest you go to the hospital to check your liver function and B-ultrasound, and usually use some chrysanthemum tea to recuperate.

From Xingtai People's Hospital, Hebei Province

Traditional Chinese medicine believes that the blackening of tongue coating is caused by hot polarization fire. Some people with gastrointestinal problems are prone to cold and dampness, and the tongue coating will become thick and greasy, white at first, and gradually turn yellow or black. When the spirit is in a state of high tension, black coating will also appear. Often staying up late, smoking and drinking too much, it is easy to appear black coating. In addition, some foods, such as sour plum, black sesame paste and so on. Or drugs, such as compound licorice tablets and iron.

Nangong duantou town Nanzhangzhuang village clinic