bubble_chart Content

bubble_chart Concept

A white and greasy tongue coating refers to a layer of white, turbid, and greasy coating on the surface of the tongue. The coating is dense, with fine particles, and is not easily scraped off.

The white and greasy coating is not mentioned in the "Treatise on Cold Damage Diseases." In the chapter on Yangming disease, there is a passage: "Yangming disease, with hard fullness below the ribs, no bowel movement, vomiting, and a white coating on the tongue, can be treated with Minor Bupleurum Decoction," which likely refers to a white and slippery coating.

Warm disease scholars have begun to pay attention to the study of white and greasy coatings. Xingse Waizhen Jianmo states, "Latent pathogens and seasonal pathogens both arise from within, often accompanied by dampness. Therefore, at the onset, there is already a white coating on the tongue, which is thick rather than thin, greasy rather than slippery, or coarse like accumulated powder." This indicates that white and greasy coatings are also commonly seen in latent pathogens.

Although both white and greasy coatings and white and curdy coatings are thick, they are different. The curdy coating has coarse particles and is easily scraped off, while the greasy coating has fine particles that adhere to the tongue surface and are not easily wiped off, which helps to distinguish them.

Normal people may develop a white and greasy tongue coating after consuming milk or soy milk, which is considered a stained or false coating and not a pathological condition.

bubble_chart Common Symptoms and Signs

1. External contraction of cold-dampness with a white and greasy tongue coating: The tongue coating is thin, white, and greasy, accompanied by aversion to cold, fever, headache, a feeling of heaviness in the head, body aches, no sweating, and a floating and tight pulse.
2. Dampness obstruction of the membrane source with a white and greasy tongue coating: The tongue coating is thick, white, greasy, and dry, or as thick as accumulated powder, with a red tongue, fever and chills, body pain with sweating, heavy limbs, vomiting, abdominal distension and fullness, and a slow pulse.
3. Internal retention of cold fluids with a white and greasy tongue coating: The tongue coating is white, greasy, and slippery, with a bluish-purple tongue, pale or dull complexion, dizziness, fatigue, cold limbs, vomiting of clear saliva, epigastric and abdominal distension and fullness that improves with warmth, no thirst or thirst without desire to drink, scanty urine, and a deep and slow pulse.

bubble_chart Differential Analysis

1. External contraction of cold-dampness with a white and greasy tongue coating: This pattern is caused by exposure to cold after sweating, or being exposed to wind after bathing, or getting caught in rain, or walking in the dew at night, leading to the invasion of cold-dampness pathogens, which obstruct the defensive yang. Cold causes the color to be white, and dampness causes the coating to be greasy. Since the cold-dampness is on the exterior, the tongue coating appears thin, white, and greasy, with no change in the tongue body. Aversion to cold, fever, heavy body pain, no sweating, and a floating and tight pulse are all signs of external wind-cold binding. Tongsu Shanghan Lun．Six Channels Tongue Coatings: "However, it must be white, floating, slippery, and thin, and the coating returns immediately after being scraped off, indicating cold pathogens in the exterior of the Greater Yang channel." Here, "white, floating, slippery, and thin" likely refers to a thin, white, and greasy coating, indicating cold-dampness invading the exterior of the Greater Yang channel. Treatment should focus on warming and dispersing cold-dampness, and the formula Notopterygium Overcoming Dampness Decoction is recommended.
2. Dampness obstruction of the membrane source with a white and greasy tongue coating: This pattern is caused by the invasion of dampness-heat pathogens, or by internal accumulation of dampness turbidity combined with external pathogens, as Xue Sheng-bai said: "Taiyin internal damage, with dampness and fluid retention, and the intrusion of pathogens, leads to the mutual attraction of internal and external factors, resulting in dampness-heat disease." Dampness-heat moves from the exterior to the interior, accumulating between the membrane source, causing yang qi to be depressed and dampness turbidity to rise, resulting in a white and greasy tongue coating. Its characteristics are: a white, greasy, dry, and thick coating, or white like accumulated powder, accompanied by aversion to cold, fever, body pain with sweating, vomiting, abdominal distension and fullness, and other signs of pathogens in the half-exterior and half-interior. Treatment should focus on resolving dampness, dispelling turbidity, and clearing heat, and the formula Membrane-Source-Opening Decoction or Lei's method of opening onto the pleurodiaphragmatic interspace (Shibing Lun) is recommended.
3. Cold-dampness retention with white greasy tongue coating: This is often caused by the deficiency of spleen yang leading to the retention of water and dampness. The tongue coating is white, thick, greasy, and slippery, resembling thick soy milk, with a bluish-purple tongue body. During diagnosis, symptoms such as abdominal distension and fullness, poor appetite, cold extremities, vomiting of clear fluid and phlegm, and a deep, slow pulse may be observed, indicating the internal retention of dampness. "Tongue Mirror Differentiation" states: "A white, thick, powdery, moist, and greasy coating that can be slightly scraped off but accumulates like flour mixed with water indicates interior cold and damp stagnation. Using Caoguo to invigorate spleen yang can promote the rising of qi, thereby eliminating the white coating caused by dampness." The treatment should focus on warming yang, invigorating the spleen, and promoting water metabolism. The recommended formula is Spleen-Warming Decoction.

The symptom of a white greasy tongue coating has been widely recognized by medical practitioners throughout history as indicating dampness, phlegm, or cold. "Guide to Tongue Differentiation" mentions: "A white, slippery, and greasy coating indicates damp turbidity and phlegm. A thick, slippery, and greasy coating suggests damp phlegm and cold." However, the specific symptoms vary depending on the location of the pathogenic factors. In cases of external contraction of cold-dampness, the pathogenic factor is in the exterior, and the tongue coating is thin, white, slippery, and greasy, accompanied by symptoms of cold-dampness binding the exterior. In cases of dampness obstructing the membrane source, the pathogenic factor resides in the half-exterior and half-interior, with a white, thick, greasy, and dry tongue coating, or resembling accumulated powder, and a slightly red tongue body, accompanied by symptoms of dampness obstructing yang qi. In cases of cold-dampness retention, the pathogenic factor is retained in the zang-fu organs, with a white, thick, greasy, and slippery tongue coating, a bluish-purple tongue body, and symptoms of fluid retention. These three patterns can be easily distinguished based on the characteristics of the tongue coating and accompanying symptoms.

bubble_chart Literary Supplement

1. 《Treatise on Cold Damage Diseases．Differentiation and Treatment of Taiyang Disease Pulse and Symptoms》："If there is a thoracic accumulation, diet remains normal, frequent diarrhea, floating pulse at the cun position, small, thin, deep, and tight pulse at the guan position, it is called visceral binding, and if the tongue has a white and slippery coating, it is difficult to treat."
2. 《Guide to Tongue Differentiation．Differentiation of Tongue Colors》 quotes Ma Liangbo: "If the tongue is thick and greasy like accumulated powder, it is called pink tongue coating. The old theory considered it as white coating, but in fact, powder and white are different, one cold and one hot, like water and fire taking different paths. Warm diseases, Rebing, pestilence, seasonal epidemics, and external contraction of filthy and evil qi, with internal accumulation of latent cold or heat, pathogenic heat spreading, and triple energizer filled, often show this tongue. Treatment should focus on clearing and cooling to drain heat. If the coating is powdery white and dry, then it is urgent to use Rhubarb and Coptis Heart-Draining Decoction or even purgation with nitre and rhubarb. It is crucial to avoid sticking to the old theory and mistaking it for white coating, as that would be a grave mistake."