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Yangming disease presenting with tidal fever, loose stools, normal urination, and persistent fullness in the chest and hypochondrium is primarily treated with Xiaochaihu Tang (Chest-Shoulder Minor Decoction) (Formula found in Shaoyang Chapter 2).

This occurs because the Yangming Stomach Fu organ is constrained by Shaoyang channel pathogens. The Yang Qi is suppressed and forced, resulting in tidal fever; the fecal matter cannot be retained, leading to slippery, loose stools. With Stomach Qi rebelling and Gallbladder Qi stagnating, the channel Qi fails to descend, causing fullness and knotting in the chest and hypochondrium. It is appropriate to use Xiaochaihu Tang to half-nourish the interior Qi of Yangming and half-drain the exterior pathogens of Shaoyang.

In Yangming disease, if there is hardness and fullness below the costal margin, constipation accompanied by vomiting, and a white coating on the tongue, Xiaochaihu Tang may be administered (Formula found in Shaoyang Chapter 2). Once the Upper Jiao becomes unobstructed, body fluids descend, Stomach Qi harmonizes, and the patient naturally sweats, leading to resolution.

This happens because Yangming is constrained by Shaoyang pathogens: when Qi in the lower epigastrium sinks, it causes loose stools; when Qi in the upper epigastrium rebels, it causes vomiting. Stomach Qi rebellion prevents fluids from descending, and turbidity stasis accumulates in the Heart region, resulting in a white tongue coating. This is due to congestion in the Lung and Stomach obstructing the Upper Jiao. Chai Hu (Bupleuri Radix) and Huang Qin (Scutellariae Radix) drain Shaoyang channel pathogens and relieve constraint, thereby unblocking the Upper Jiao, allowing fluids to descend, harmonizing Stomach Qi, and resolving the condition through sweating.

Shaoyang is based on Jia Wood and transforms its Qi into Ministerial Fire. Its channels lie between the Two Yangs and the Three Yin. When Yin and Yang contend, chills and fever occur. If, after prolonged illness, Yang prevails and Yin declines, only heat without chills appears, indicating transmission to Yangming. If Yin prevails and Yang declines, only cold without heat appears, indicating transmission to Taiyin. Xiaochaihu Tang clears and resolves the semi-exterior, blocking the path to Yangming; it warms and tonifies the semi-interior, closing the gate to Taiyin. This prevents Yin and Yang from becoming excessive in one direction, resolves exterior pathogens within their own channel, and is termed "harmonizing Shaoyang." When Shaoyang channel Qi descends from head to foot, Ministerial Fire stores itself, warming the waist and knees. If Ministerial Fire rebels upward, it blazes fiercely, burning the chest and diaphragm. Rising Ministerial Fire easily consumes body fluids and blood; therefore, Shaoyang diseases often transmit to Yangming, typically treated with Da Chaihu Tang. Treating Shaoyang channel disease while simultaneously addressing Yangming fu disease is based on this principle. Methods such as warm needle therapy, sweating, and purging that deplete fluids and consume blood are strictly contraindicated in Shaoyang disease, lest Yin injury lead to transmission to Yangming. However, in combined Taiyang and Shaoyang disease, there are patterns involving vomiting and diarrhea. Vomiting and diarrhea are not merely Taiyang or Shaoyang diseases but essentially Yangming diseases. Because Jia Wood depression overacts on Wu Earth, the Stomach, as the official of granaries, suffers from external pressure and internal constraint by Jia Wood pathogens, failing to accommodate food and fluid, thus causing upper vomiting and lower diarrhea. Fundamentally, Stomach disease causes Qi rebellion, which manifests as vomiting; Spleen disease causes Qi sinking, which manifests as diarrhea. Frequent vomiting indicates Shaoyang transmitting to Yangming; frequent diarrhea indicates Shaoyang transmitting to Taiyin. Thus, Shaoyang transmitting to Taiyin is indeed common, as elucidated in Chapter 18: "In cold damage after six or seven days, if the person is irritable, it means Yang has departed and entered Yin." Therefore, detailed discussion in this chapter is unnecessary, as the main purport is clear.