Gastric disease patients who carefully observe their own tongue coating often notice unusual features: some are exceptionally thick and greasy, some are black, some are yellow, some are peeled off. Indeed, changes in the tongue coating can reflect diseases, especially certain gastric and intestinal conditions.
Thick coating with bad breath: If someone consistently has a very thick tongue coating and bad breath, it generally indicates a minor issue with the stomach. If there are no other discomforts, one can start by adjusting diet and lifestyle. After a period of adjustment, abnormal tongue coating and bad breath may resolve on their own.
Black, sticky coating: If only this abnormal coating is seen and the edges and tip of the tongue remain normally pale red, with no other obvious discomfort, it may be a "coloring" phenomenon. This is not pathological and does not require concern. However, patients with severe gastric disease should be vigilant if they notice black coating; if the edges and tip of the tongue turn deep red or even bluish-purple, it indicates worsening condition and prompt medical attention is needed.
Geographic tongue: Some people have irregular patchy changes on their tongue surface—some areas have thin coating, others are smooth and bare—this is known as "geographic tongue." If there are no discomforts, this is usually physiological and does not require treatment. If someone with long-term gastric disease or other chronic illness has never seen such a tongue before and suddenly develops geographic tongue, it is likely due to yin deficiency and requires prompt medical consultation.
Fissured tongue: Some people have numerous cracks on their tongue surface, mostly without coating, known as "fissured tongue." If there are no discomforts, it is also physiological and does not require treatment. If fissured tongue appears after a serious illness, with a red tongue and no coating, and there are discomforts, it is also considered yin deficiency and requires medication.
Teeth marks on the tongue edge: Some people have large bodies and enlarged tongues, with teeth marks on the edges, thin white coating, and no obvious discomfort—this is due to obesity. Traditional Chinese theory holds that "fat people often have phlegm-dampness," meaning their spleen and stomach functions are relatively weak, making digestion and absorption prone to obstacles. Such people should avoid oily, hard-to-digest foods, eat more vegetables, fruits, and light meals, and engage in appropriate exercise. If the tongue coating is white and greasy, with teeth marks on the edges, lack of appetite, abdominal distension, and loose stools, it indicates excessive phlegm-dampness, and treatment with medication is necessary alongside dietary adjustments.
Red tongue, thick coating, constipation: If someone hasn't had a bowel movement for several days, has bad breath, thick tongue coating, red edges and tips, and yellow urine, this indicates excessive stomach fire. Excessive internal heat in the stomach causes turbid qi to rise and scorch the mouth and tongue, resulting in bad breath and yellow tongue coating; heat damages body fluids, causing intestinal dryness, leading to constipation. At this point, one can take Chinese herbs like Da Huang, Huang Lian, Huang Qin, and Shan Zhi to clear heat and purge fire. In diet, avoid alcohol and spicy, hot foods like chili peppers and lamb, eat more vegetables, fruits, and light meals, and drink plenty of water.
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