1. Normal tongue coating is reddish with thin white coating.
2. Pale white tongue: Pale white tongue indicates deficiency of both qi and blood.
3. Red tongue coating: The ear texture of red tongue coating is rough, suggesting that it is full of heat.
4. ecchymosis moss: there are ecchymosis on the tongue, suggesting blood stasis.
5. White greasy coating: The coating of the tongue is thick and greasy and clings to the surface of the tongue, which can't be scraped off, mostly due to dampness, phlegm and food stagnation.
6. Yellow and greasy fur: thick and greasy tongue coating with red spots on the tip of the tongue, suggesting that damp heat accumulates.
7. Map tongue: The tongue coating falls off like a map, with irregular shape, slightly convex edge and partial displacement, which is mostly caused by insufficient stomach qi and yin.
8. Mirror tongue: The tongue surface is smooth as a mirror, which is called "mirror tongue", indicating that stomach qi and stomach yin are dry.
Extension: Don't eat food that easily discolors the tongue during tongue diagnosis, otherwise it will be easily misdiagnosed.
Conclusion: Tongue diagnosis is simple and easy, and the change of tongue picture can objectively and accurately reflect the condition, which can be used as an important basis for diagnosing diseases, understanding the development and changes of the condition and syndrome differentiation. In thousands of years of clinical practice, tongue diagnosis has been constantly tested, and some people even think that tongue diagnosis is more important and reliable than pulse diagnosis. The clinical significance of tongue diagnosis has the following aspects. 1. Distinguish the depth of lesions; 2. Identify the nature of pathogenic factors; 3. Judge the rise and fall of evil; 4. Analyze the advance and retreat of diseases; 5. Predict the prognosis of the disease.