What does a greasy tongue coating typically signify in TCM?

A greasy tongue coating is primarily associated with conditions of Dampness or Phlegm in Traditional Chinese Medicine (TCM). This type of coating suggests the presence of excessive moisture in the body, which disrupts the normal functions of the Spleen and Stomach. In TCM theory, the Spleen is responsible for transforming and transporting fluids; when it is weak or overwhelmed, it can lead to the accumulation of Dampness.

The greasy nature of the coating indicates an imbalance, where the body is unable to properly process fluids, resulting in stagnation. This stagnation can manifest as conditions like digestive issues, feelings of heaviness, or symptoms of excess. Furthermore, when Phlegm develops, it can obscure the clear Yang energy, leading to more severe symptoms affecting different body functions.

This understanding of a greasy tongue coating aligns with TCM principles, where the tongue serves as a map for diagnosing internal health conditions. Observing a greasy coat during an examination is a visual cue for practitioners to consider Dampness or Phlegm as a significant part of the patient's pathology. This is why the response indicating that a greasy coating signifies Dampness or Phlegm is accurate in the context of TCM diagnostics.