Is Thick, Greasy Tongue Coating Due to "Fire" in the Body?
In traditional Chinese medicine, thick, greasy tongue coating most commonly reflects "stagnation of stomach qi" rather than "fire in the body," indicating overall decline in digestive system function, typically seen in individuals who consume large amounts of fish, meat, and sweet, rich foods. How to determine whether there is actual fire? According to basic TCM diagnostic principles, if thick, greasy tongue coating is accompanied by symptoms such as bitter taste, sticky mouth, halitosis, oral ulcers, thirst, constipation in the lower burner, or yellow, hot, foul-smelling urine and rectal burning, or even boils and carbuncles, then it is considered "fire." Without these symptoms, it is merely "food accumulation stagnation." Patients need only take cooling herbs to help clear the tongue coating.
Another situation commonly affects children, elderly people, or those recovering from long-term or serious illnesses with weakened constitutions. These individuals suffer from qi and blood deficiency, weak digestive function, unable to properly digest, absorb, or excrete, leading to thick, greasy tongue coating. TCM terms this "deficiency at root, excess at surface." If this is misclassified as "fire," the already weak spleen and stomach, along with the entire body, may suffer significant damage under the harsh effects of cold and bitter herbs. Patients should seek guidance from specialized physicians before taking medication.