Exterior syndrome (chills, fever, headache) refers to diseases that are relatively outside the body surface; Internal syndromes (cough, asthma, palpitation and abdominal pain) exist in the body, viscera, meridians and qi and blood.
Dialectics of tongue coating: the tongue coating that was not thick before became thick, that is, from the outside to the inside. If the original thick tongue coating becomes thinner, it means that the condition has improved.
Normal tongue coating is dry and wet. If it is wet, Chinese medicine says that body fluid is flooding. For example, spleen deficiency will drool and spleen deficiency will lose luck.
If it is dry, it means that the body fluid is damaged and there is heat in the body to boil the water dry.
Greasy and rotten are both thick, which are both the main and internal syndromes. The difference is:
Tongue coating looks more delicate, with fine particles and tight adhesion, and it is not easy to scrape off. It looks like a greasy coating.
Tongue coating used to look thick and loose, just like bean curd residue, which can be scraped off and called tofu.
Annoying rot is related to phlegm, dampness and food accumulation.
Phlegm-dampness and greasy fur need to eliminate phlegm and dampness to see if it is white or yellow. Cold syndrome is mostly white and greasy with fur, and it is warm, expectorant and wet; Yellow greasy fur is more common in damp heat, which needs to clear away heat and resolve phlegm.
Some people have no tongue coating on their tongues, which is (peeling), and some are peeling in the middle, which is flower peeling.
Tongue coating is formed by rising spleen qi and steaming stomach qi. When body fluid and gastric juice are insufficient, spleen and stomach qi are injured, tongue coating will fall off.
Another is to remove the whole tongue coating and make it smooth as a mirror. This is the mirror tongue. This is because of deficiency of stomach yin.