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The heat pathogen of the Yangming channel, if it has already entered the Fu organs, will not transmit to other meridians. If it remains in the channels and has not yet entered the Fu organs, it can still transmit to the Shaoyang. The precise location of the Shaoyang must be analyzed in detail. The Taiyang governs the exterior, the Yangming governs the interior, and that which lies between the Taiyang and Yangming is the Shaoyang. When Shaoyang combines externally with Taiyang, chills manifest; when it combines internally with Yangming, fever manifests. Therefore, diseases of the Shaoyang present with alternating chills and fever. From this reasoning, the sequence of disease transmission should proceed from Taiyang to Shaoyang, and from Shaoyang to Yangming. However, why does the *Neijing* (Classic of Internal Medicine) state that on the first day the Juyang (i.e., Taiyang) is affected, on the second day the Yangming is affected, and on the third day the Shaoyang is affected? It is because other paired Hand and Foot meridians of the same name have distinct boundaries, whereas the Shaoyang exclusively governs the Membrane Source (Mo Yuan, a network of membranes in the body). The membranes in the human body are all interconnected. Some membranes connect to the Taiyang meridian, specifically the white membranes beneath the skin within the interstices (Cou Li). Some membranes connect to the Yangming meridian, specifically the fascial layers between subcutaneous fat and muscle. This is why the Hand Shaoyang meridian designates the Sanjiao (Triple Burner) as its Fu organ (The Sanjiao is also membrane-based, originating from the Mingmen Gate. The Lower Burner consists of membranes enveloping the kidneys and connecting to the intestines; the Middle Burner comprises membranes enveloping the spleen and connecting to the stomach; the Upper Burner includes the diaphragm below the heart and the membranes connecting the heart and lungs). Furthermore, beneath both hypochondriac regions lies plate fat (Ban You), which is also enclosed by membranes. This is why the Foot Shaoyang meridian designates the Gallbladder as its Fu organ. From this, we know that what lies between the Taiyang and Yangming is the Hand Shaoyang meridian; what transmits after the Yangming is the Foot Shaoyang meridian. Transmission from Taiyang to Yangming originally passes through the Hand Shaoyang, but the *Shanghan Lun* (Treatise on Cold Damage) does not mention it because it emphasizes the Foot meridians over the Hand meridians. In summary, the membranes of the Hand and Foot Shaoyang are inherently connected, and the Qi transformation of the Hand and Foot Shaoyang is inherently continuous. Thus, the *Neijing* refers to the Shaoyang as the "Wandering Department" (You Bu), meaning its Qi transformation moves freely between the Hand and Foot meridians without fixed direction. Furthermore, we understand that what combines with the Taiyang is the membrane of the Hand Shaoyang within the interstices, and what combines with the Yangming is the membrane of the Foot Shaoyang associated with the plate fat, due to their proximity allowing such combination. Understanding these principles allows one to discuss the diseases of the Shaoyang chapter.

Original text from *Shanghan Lun*: The manifestation of Shaoyang disease involves bitter taste in the mouth, dryness of the throat, and vertigo/dizziness of the eyes.

Original text from *Shanghan Lun*: In Shaoyang Wind-Strike, symptoms include bilateral deafness, redness of the eyes, fullness in the chest, and irritability. Purging (Tu) and Draining Down (Xia) methods are contraindicated; using them will result in palpitations and fright.

Original text from *Shanghan Lun*: In cold damage, if the pulse is wiry and thin, accompanied by headache and fever, it belongs to Shaoyang. Shaoyang disease is contraindicated for Sweating (Fa Han) therapy. Inducing sweating will lead to delirious speech, indicating involvement of the Stomach (Wei). If the Stomach harmonizes, recovery occurs; if the Stomach does not harmonize, irritability and palpitations ensue.

The syndromes described in this section represent the Shaoyang disease biased towards Heat. A wiry and thin pulse is indeed characteristic of Shaoyang. Observing the emphasis in the outline on the importance of Stomach harmony versus disharmony, it is inferred that when transmitting from Yangming to Shaoyang, half of the exogenous heat still enters the Fu organs rather than transmitting entirely to the Shaoyang. Although the pulse is wiry and thin, deep pressure reveals it to be very forceful. This originally constitutes a combined disease of Shaoyang and Yangming. When I encounter such syndromes and pulses, I often halve the ingredients of the Chaihu Tang (Bupleurum Decoction) (except for Renshen [Ginseng Root] and Gancao [Licorice Root], which remain unchanged), adding Sheng Shigao (Raw Gypsum Fibrosum) 1 liang and Zhi Mu (Anemarrhenae Rhizoma) 5 qian. This equates to using half doses of Baihu Jia Renshen Tang (White Tiger Decoction plus Ginseng) and Xiao Chaihu Tang (Minor Bupleurum Decoction). In this manner, the Shaoyang disease can be resolved, and the heat in the Stomach can be completely cleared, avoiding the risk of Stomach disharmony. This section, combined with the previous one, establishes the three prohibitions for Shaoyang disease: Sweating, Purging, and Draining Down. Those treating Shaoyang disease must keep this in mind.