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Since the entries regarding tongue coating have been collected, the entries regarding body fluids (Jinye) should now be collected. The Kidney governs body fluids, irrigating the Zang-Fu organs internally, connecting with the root of the tongue via meridians, and reflecting pathological conditions externally. Therefore, observing the quantity of body fluids allows one to ascertain the prosperity or decline of Kidney Qi; observing whether the fluids are slippery or astringent allows one to determine the cold or heat nature of the pathogenic factor. From this perspective, there are cases of slipperiness due to external cold, slipperiness due to internal cold, astringency due to deficient heat, and astringency due to excess heat.

Various medical texts state: When there is a white coating on the tongue that is greasy and slippery, accompanied by coughing, counterflow qi, and shortness of breath, it indicates Phlegm-Fluid retention (Tanyin). When there is coughing but saliva is present in the mouth, and the tongue coating is slippery, it indicates Lung Cold. When the pulse is tight at both Yin and Yang positions, warm air exits the mouth, lips and mouth are dry, the body curls up in bed, feet are cold, nasal discharge occurs, and the tongue coating is slippery, do not treat rashly. After seven or eight days, if the patient exhibits slight fever and warmth in the hands and feet, this indicates the disease is about to resolve. However, if after eight or more days, high fever returns, this is difficult to treat. If accompanied by aversion to cold, vomiting will likely occur; if there is abdominal pain, diarrhea will likely occur.

When the tongue has no coating and feels cold and slippery, the pulse is faint with aversion to cold, and the body curls up in bed, it indicates Cold invading the Shaoyin channel (Shaoyin Zhonghan). In Zang-Jie syndrome, if the tongue has a slippery white coating, it is difficult to treat. When the arms cannot be lifted, the root of the tongue is dry, frequent sighing occurs, chest pain prevents turning over, and eating leads to vomiting and sweating, it indicates Cold invading the Liver (Gan Zhonghan). When the tongue has no coating and is dry, it signifies insufficiency of the Kidney essence and exhaustion of body fluids. When the center of the tongue coating is thick, black, and dry, it is called "Baked Tongue" (Beishe), indicating pathogenic transmission to the Shaoyin channel with extreme heat causing fluid depletion.

When there is both aversion to cold and fever, but body fluids remain normal, the pathogen is in the exterior of the Taiyang channel. A thick, dry white coating, absence of sweat, aversion to cold, and body pain indicate the exterior condition has not resolved. In febrile diseases lasting five or six days, dry mouth, dry tongue, and thirst indicate Shaoyin disease. Dry tongue, swollen throat, upward rushing qi, dry and painful throat, irritability, and heart pain indicate the disease is located in the Foot-Shaoyin channel. Dry throat and thirst with a non-slippery, astringent tongue coating indicate pathogenic transmission to the Jueyin channel. Dry body fluids with a tongue coating indicate the transmission of exterior pathogens to the interior. A scorched tongue, withered lips, dryness like wax, and dry throat indicate closed pores and inability to sweat.

After purging or vomiting in Shanghan (Cold Damage), if the disease persists for seven or eight days, with occasional aversion to wind, extreme thirst, dry and irritable tongue, and desire to drink several liters of water, it indicates Heat binding in the interior with heat in both the interior and exterior. Desire to drink water, dry mouth, and dry tongue indicate Heat in the interior consuming body fluids. Black prickles on the tongue that are cracked and dry indicate extreme heat and exhaustion of fluids. Gray-black tongue with dry prickles in the center, dry throat, and dry mouth indicate Heat binding in the Shaoyin. Full tongue black coating with large prickles, dryness, and a red base indicates an excess pattern suitable for purgation therapy.

On the eleventh day of Shanghan, if the tongue becomes dry followed by sneezing, it indicates the decline of Shaoyin disease. In dysentery, a yellow, dry tongue without thirst, fullness in the chest, and unceasing diarrhea constitutes a fatal syndrome. Abdominal fullness, dry mouth, and dry tongue indicate Water-Qi in the intestines. A black, coating-less, and dry center of the tongue indicates injury to body fluids with hyperactivity of deficiency fire.

These are the statements from various books regarding body fluids. I propose: A pale-red tongue with a thin, slippery coating indicates Internal Cold. A deep-red tongue with a thick, slippery coating indicates External Cold. A thin, astringent coating with a pale-red tongue indicates Deficient Heat. A thick, astringent coating with a deep-red tongue indicates Excess Heat. However, when righteous Qi is deficient, the presence or absence of pathogenic factors must be distinguished; when pathogens are excess, the strength or weakness of righteous Qi varies. One should combine these with the Five Methods and consider the Four Seasons to avoid damaging the deficient and augmenting the excess.

Regarding tongue examination, patients should eat after diagnosis so that the thickness of the coating is easy to distinguish, and drink after diagnosis so that the slipperiness or astringency is easy to identify. For tongues with dry, black coatings, one should wipe the coating with honey before observing its color and shape. Reddish tongues are treatable; bluish-black tongues are untreatable. This is also what should be known from tongue inspection. As for the differentiation of tongue regions, based on color, shape, coating, or fluids, one can infer analogously, so they are not collected here.