What is the color of the tongue coating caused by kidney yin deficiency?

The shape, size, color, etc. of the tongue can reflect the function of the kidneys. You can understand the condition of your kidneys by looking at the tongue in your mouth. So what are the symptoms of kidney deficiency tongue?

1. Normal tongue appearance

The tongue is moderately thick and thin, and can be turned flexibly;

The tongue is light red and moist; the tongue coating is thin and white, with even particles, moderate dryness and wetness, thinly spread on the surface of the tongue, and cannot be wiped off.

2. Tongue size in kidney deficiency

The tongue is thinner than a normal tongue, the tongue is redder than a normal tongue, it is crimson in color, and there is no coating on the tongue, which is a manifestation of kidney yin deficiency.

The tongue is fatter than a normal tongue, paler and more delicate than a normal tongue, has tooth marks on the edge of the tongue, and has a white tongue coating, which is a manifestation of kidney yang deficiency.

3. Cracked tongue

The tongue surface has cracks of varying lengths, depths, and shapes, which is called a "cracked tongue". Fissured tongue is often a manifestation of kidney yin deficiency.

4. No tongue coating

There is no tongue coating on the tongue, and the tongue surface is as smooth as a mirror, which is called "bald tongue" and is a manifestation of severe kidney yin deficiency.

5. No coating on the root of tongue

The root of the tongue belongs to the kidney, therefore changes in the root of the tongue reflect the condition of the kidney. For example, if there is coating on other parts of the tongue but not on the root of the tongue, it is a manifestation of kidney yin deficiency.

6. Black tongue coating

First, the tongue is red, the tongue coating is black and dry, even cracked, or has thorns, which is a manifestation of extreme heat evil and kidney yin depletion, which is a critical symptom;

Second, the tongue is pale and the tongue coating is black and smooth, which is a manifestation of kidney yang deficiency and is also a critical symptom.