Yellow tongue coating is neither yin nor yang deficiency. Yellow tongue coating usually represents internal and heat symptoms.
The yellowing of the tongue coating generally represents the internal evidence and heat evidence. According to the degree of yellowing of the coating, it can be classified into light yellow, dark yellow and burnt yellow. The more yellow the color of the tongue coating is, the heavier the heat evil is; light yellow coating represents light heat, dark yellow coating represents heavy heat, and burnt yellow coating represents heat knots.
When the tongue moss turns from white to yellow, or appears to be both yellow and white, it is mostly for the external symptom (mainly manifested as respiratory symptoms after feeling the external evil) in the stage of both external and internal, and transforming the heat into the internal stage. Tundra yellowish and lubrication and more fluid, known as yellow slippery moss, mostly phlegm (water metabolism disorders formed by the pathological products), cold and dampness in the body to gather for a long time to heat; or for the deficiency of qi and blood, re-experiencing dampness and heat caused by the evil.
Yellow petal moss, yellow brown moss, burnt yellow moss are the main evil heat injury, dry knot solid evidence. Yellow moss and greasy texture, known as yellow greasy moss, the main damp-heat or phlegm-heat internal, or for food accumulation (food indigestion and stagnation in the stomach) to putrefaction.
If you are not feeling well, it is advisable to go to the hospital.