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Cold-solid Jie Xiong (Chest Binding Syndrome) without heat manifestations should be treated with Sanbai Xiaoxianxiong Tang (Three-White Minor Phlegm-Thrashing Decoction); it may also be administered as a powder.
When the exterior heat of Taiyang (Greater Yang) has not yet resolved, and purgation is mistakenly applied, heat pathogens bind with cold water, forming Re-shi Jie Xiong (Heat-Solid Chest Binding).
When Taiyin (Lesser Yin) presents with abdominal fullness and intermittent pain, and purgation is mistakenly applied, cold pathogens bind with cold-natured medicines, forming Han-shi Jie Xiong (Cold-Solid Chest Binding).
"No heat manifestations" refers to the absence of irritability and pain in the four limbs.
It is named "Sanbai" (Three Whites) because all three ingredients are white, distinguishing it from Huanglian Xiaoxianxiong Tang (Coptis Minor Phlegm-Thrashing Decoction).
Old editions erroneously wrote "Sanwu" (Three Things); administering Huanglian (Rhizoma Coptidis) and Gualou (Fructus Trichosanthis) would cause excessive Yin-cold and lead to death.
Others erroneously wrote "Baisan" (White Powder), implying two different formulas.
Huanglian (Rhizoma Coptidis) and Badou (Semen Crotonis) differ in temperature like heaven and earth; suggesting that cold herbs can also be used would surely mislead people.
Moreover, some recklessly placed it after the Water Syndromes in the Taiyang chapter, and mixed text regarding body heat and skin pruritus after the formula, causing confusion.
Now moved to follow the section on chest hardness below the sternum in the Taiyin chapter, the symptoms and formula match perfectly like a tally.
Note: "Sanbai Xiaoxianxiong" does not refer to two decoctions; rather, Sanbai Powder can resolve the binding in the chest.
It should not be read as two separate sentences. Since it is termed Cold-Solid Jie Xiong, Xiaoxianxiong Tang consists of great cold medicines; using it here would be like throwing stones into a well (adding insult to injury).

Sanwu Baisan Formula (Three-Ingredient White Powder):
Jiegeng (Radix Platycodi) and Beimu (Bulbus Fritillariae Cirrhosae) (each 2 qian), Badou (Semen Crotonis) (1 fen, peeled, stir-fried until black, ground into a paste).
Grind the first two ingredients into a powder, mix with Badou, and pound further in a mortar. Mix with Baiyin (white rice gruel) for administration.
Strong individuals take half a Qianbi (a measuring spoon size); frail individuals reduce the dose.
Beimu (Bulbus Fritillariae Cirrhosae) primarily treats depression and binding in the heart and chest; Jiegeng (Radix Platycodi) can lift Qi and Blood, benefit the diaphragm, and broaden the chest.
However, without the pungent-hot nature of Badou (Semen Crotonis) breaking through barriers, how could it overcome the bitter-cold nature of Xiaoshi (Natrii Sulfas) and Dahuang (Radix et Rhizoma Rhei), allowing Yin Qi to circulate and transform into Yang?
Mixing with white rice gruel utilizes sweetness to moderate the action, keeping the medicine lingering in the chest to prevent rapid downward purging.
Powders disperse blockages, which is more precise than "decoctions sweeping away" pathogens.
If the disease is located above the diaphragm, vomiting will necessarily occur; if below the diaphragm, diarrhea will necessarily occur.
This syndrome originally involves vomiting and diarrhea, but due to hardness and binding below the chest, free flow is obstructed.
Guiding according to the pathological trend will naturally eliminate the binding.
If there is no diarrhea, drink one cup of hot porridge to promote bowel movement; if diarrhea is excessive and unceasing, drink one cup of cold porridge to inhibit the effect.
Li Dongyuan stated: "Light porridge is Yang within Yin, thus it promotes urination."
The modern practice of drinking porridge to stop diarrhea after taking Dahuang (Radix et Rhizoma Rhei) follows this legacy.