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(Oral bitterness, dry throat, dizziness, alternating chills and fever, pain in the chest and hypochondrium, chest fullness, chest pain, deafness)

Although the treatment methods for the Shaoyang (Lesser Yang) channel all belong to harmonizing methods, there is a syndrome of delirium caused by erroneous sweating with the pathogen located in the Stomach, which should be treated with purgation using Tiaowei Chengqi Tang. Although the Shaoyang channel lacks methods for resolving via sweating, the use of Xiaochaihu Tang added with Shengjiang (Fresh Ginger Rhizome) and Guizhi (Cinnamon Twig) also implies the intention of gently resolving the exterior through mild sweating.

Furthermore, the primary syndromes of this channel manifest as pain in the chest and hypochondrium, deafness, alternating chills and fever, dry retching, or vomiting bitter fluid. These are suitable for harmonization using Xiaochaihu Tang (Minor Bupleurum Decoction). If the condition does not resolve, Dachaihu Tang (Major Bupleurum Decoction) for purgation is appropriate. If there is excessive phlegm in the chest and hypochondrium, Gouti San (Melon Fruit Powder) should be used to induce vomiting. This represents the subtle purport of Zhang Zhongjing's medical wisdom.

Harmonizing method: Xiaochaihu Tang (Minor Bupleurum Decoction), Xiaochaihu Jia Guizhi Tang (Minor Bupleurum Decoction with Cinnamon Twig).
Vomiting method: Gouti San (Melon Fruit Powder).
Purgative method: Tiaowei Chengqi Tang (Regulate the Stomach and Order the Qi Decoction), Dachaihu Tang (Major Bupleurum Decoction).

The defining characteristics of Shaoyang disease are oral bitterness, dry throat, and blurred vision. The Foot-Shaoyang Gallbladder Channel is associated with the Gallbladder. The *Neijing* states that a disease manifesting as oral bitterness is named "Dan Dan" (Gallbladder Heat). The *Jiayi Jing* states that the Gallbladder is the storehouse of essence, and the Qi of the Five Zang organs depends on the Gallbladder; the pharynx serves as its conduit. The Shaoyang channel originates at the outer canthus. When the Shaoyang channel is invaded by pathogens, it results in oral bitterness, dry throat, and blurred vision. The *Huoren Shu* states that Xiaochaihu Tang (Minor Bupleurum Decoction) is appropriate. When both the Cun (inch) and Chi (cubit) pulses are wiry (Xian), it indicates Shaoyang disease. Because the channel traverses the hypochondrium and connects to the ears, it causes pain in the chest and hypochondrium and deafness. (Note: In the Shaoyang chapter, there are syndromes of chest fullness without pain. Some argue that deafness, red eyes, chest fullness, and irritability in Shaoyang disease belong to Wind Strike, while oral bitterness, dry throat, and blurred vision belong to Cold Damage.) In Shaoyang Wind Strike, where there is hearing loss, red eyes, chest fullness, and irritability, neither vomiting nor purging should be employed. Vomiting or purging will lead to palpitations and fright. (Erroneous vomiting leads to Qi deficiency causing palpitations; erroneous purging leads to Blood deficiency causing fright.) In Cold Damage, if the pulse is wiry and fine, accompanied by headache and fever, it belongs to Shaoyang. Shaoyang disease must not be treated with sweating; doing so will cause delirium. This is because the pathogen enters the Stomach. If the Stomach harmonizes, recovery ensues; if it does not, irritability and palpitations occur. (Cheng Wuji in his commentary states that wiry pulses in all three positions indicate Shaoyang invasion, while a fine pulse suggests the pathogen is gradually moving inward. Although headache and fever suggest the exterior is not yet resolved, the wiry and fine pulse indicates the pathogen resides in the Shaoyang, half-exterior and half-interior, thus precluding sweating. Sweating depletes body fluids, leading to dryness in the Stomach. The Shaoyang pathogen then transmits into the Stomach, inevitably causing delirium. At this point, Tiaowei Chengqi Tang (Regulate the Stomach and Order the Qi Decoction) should be administered to purge; once the Stomach harmonizes, the patient recovers. If not purged, the Stomach will be constrained by the Wood pathogen of Shaoyang, resulting in irritability and palpitations. Generally, headaches indicate an exterior condition, but this specific headache belongs to Shaoyang due to the wiry and fine pulse. Whether to sweat or not should be judged by this criterion. If this is a combined Shaoyang and Yangming disease, severe cases suit Xiao Chengqi Tang (Minor Bupleurum Decoction), while mild cases suit Dachaihu Tang (Major Bupleurum Decoction). Since Shaoyang disease should not be purely purged and Yangming disease requires purging, Xiao Chengqi Tang is given in small amounts to achieve mild laxation. Cheng Wuji’s preference for Tiaowei Chengqi Tang is incorrect; Tiaowei Chengqi Tang is indicated for Taiyang-Yangming diseases, a distinction that must not be overlooked.)

Three days after Cold Damage, if the Shaoyang pulse becomes small, the disease is about to resolve. (Cheng Wuji cites the *Neijing*: a large pulse indicates excess pathogen, a small pulse indicates peace/recovery. Three days after Cold Damage, when the pathogen transmits to Shaoyang, the pulse should be wiry and tight. A now-small pulse indicates the pathogen is weak and the disease is resolving.)

Shaoyang disease tends to resolve between Yin and Chen hours (03:00–07:00). The *Neijing* states that Lesser Yang among the Yang channels corresponds to Spring Qi; Yin, Mao, and Chen hours are when Shaoyang Wood energy is prosperous.

Haizang analyzed the theories of Exterior, Interior, and Middle. Assuming Shaoyang symptoms: if any one of the following is present—headache, alternating chills and fever, floating pulse—it constitutes an Exterior syndrome. If any one of the following is present—loss of taste, abdominal disharmony, constipation or diarrhea/irregular bowel movements—it constitutes an Interior syndrome. If neither Exterior nor Interior syndromes are present, the remaining manifestations are deficient heat, indicating the disease is in the Middle Jiao.

Zhang Yuansu stated: It is said that the Shaoyang Gallbladder channel winds and coils more than other channels. Yet, observing the Shaoyang chapter, the treatments are simple, and no specific herb is cited as the primary method for this channel. Why? Regarding meridian locations, the Taiyang channel is posterior, serving as the Exterior; the Yangming channel is anterior, serving as the Interior; the Shaoyang channel is lateral, sandwiched between the Exterior and Interior, hence termed Half-Exterior Half-Interior. Treatment for the Exterior suits sweating; treatment for the Interior suits purging. Since it resides between the two, neither sweating nor purging is suitable, thus there is no fixed standard treatment method. The classic states that in Shaoyang Wind Strike, with hearing loss, red eyes, chest fullness, and irritability, vomiting and purging are contraindicated as they cause palpitations and fright. Another passage states sweating is contraindicated. Thus, the three methods of sweating, purging, and vomiting are all taboo for Shaoyang. Formulas merely employ harmonizing methods. Therefore, Zhang Zhongjing exclusively used Xiaochaihu Tang (Minor Bupleurum Decoction) as the most appropriate treatment. However, although the channel has many branches, it does not follow the main pathway, so pathological manifestations are not numerous.