Tongue coating is an important part of traditional Chinese medicine diagnosis.  By observing the color, thickness, dryness and other characteristics of tongue coating, we can judge the health status of the body.

Tongue coating color: tongue coating color can be divided into white, yellow, gray and black three kinds.  White tongue coating is generally normal tongue coating, if the patient has fever, hands and feet cold and other symptoms, may indicate that the body has cold syndrome, wet syndrome.  Yellow tongue coating generally indicates the occurrence of internal syndrome and heat syndrome in patients.  The gray and black tongue coating indicates that the patient's body is cold and damp, the phlegm and fluid are stopped, and the Yin and cold are extreme.

Tongue coating thickness: The thickness of tongue coating is also an important indicator to judge the health status of the body.  If the tongue coating is thin, the condition is generally mild;  Thicker tongue coating indicates more serious illness.  In the course of disease development, the tongue coating changes from thin to thick, indicating that the disease pathogen enters and the disease changes from light to severe.  If the tongue coating becomes thin from thick, it indicates that the pathogenic factors are transparent and the condition is improved.

Moistening degree of tongue coating: Moistening degree of tongue coating can also reflect the health status of the body.  If the tongue coating is more moist, and accompanied by diarrhea, loss of appetite and other symptoms, then it indicates that the patient's spleen deficiency and dampness in the body.  If the tongue coating is dry, accompanied by nausea, nausea, indigestion and other symptoms, the patient may have a strong stomach fire symptoms.

In addition to the above three main features, other manifestations of tongue coating such as flaking, rootless, etc., can also provide diagnostic basis.  However, it should be noted that tongue coating is only one aspect of traditional Chinese medicine diagnosis, and it also needs to be combined with other symptoms, signs and pulse conditions.

With the development of science and technology and the market demand for traditional Chinese medicine, technology can speed up the judgment of medical students on various tongue coating information, and the instrument of tongue surface pulse information monitoring and analysis system also appears, and is not only improved, making it an important assistant for medical students