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When a disease recovers from the Shaoyang (Lesser Yang) stage, it is expelled outward by leveraging the pivot function of the Shaoyang. However, if treatment is improper, the pathogen cannot be expelled via the Shaoyang pivot and instead penetrates into the abdominal cavity through the membranous spaces (membrane origin), representing a transmission from Shaoyang to Taiyin (Greater Yin). Since the pathogen has transmitted to Taiyin, the clinical presentation must inevitably change, necessitating a different therapeutic approach. Therefore, the symptoms manifesting in the Taiyin meridian and their corresponding treatments require further study.

Original text from *Shanghan Lun* (Treatise on Cold Pathogenic Diseases): The general outline of Taiyin disease includes abdominal fullness, vomiting, inability to eat, worsening spontaneous diarrhea, and occasional spontaneous abdominal pain. If purgatives are incorrectly applied, it will certainly result in chest congestion and hardness.

The spleen is the fu-organ of Taiyin. Its location is wrapped in layers of adipose tissue, which constitutes the pathway of the Taiyin meridian. Anatomically, it appears to be within the middle jiao (middle burner), but the adipose tissue here is denser than elsewhere. Thus, although the Taiyin meridian connects with the Sanjiao (Triple Burner), it does not mix with it. Furthermore, *Nanjing* (Classic of Difficult Issues) states that the spleen contains half a jin (approx. 250g) of "San Gao" (loose fat/pancreas), which corresponds to what Western medicine calls pancreatic juice. This substance is formed by the aggregation of the pancreas. Medical texts describe it as an accessory organ of the spleen; its secretions aid digestion in the small intestine and essentially fall within the territory of the Taiyin meridian. Because this meridian resides in the center of the abdomen, abdominal fullness is a characteristic symptom of Taiyin meridian disease. Vomiting food and spontaneous diarrhea occur because the meridian disease affects the fu-organ; spleen dysfunction leads to an inability to transport and transform food and drink, resulting in simultaneous vomiting and diarrhea. Abdominal pain arises because the disease is in Taiyin, causing stagnation and fullness in the middle jiao with impaired qi transformation. Incorrect use of purgatives leads to chest congestion and hardness because purging causes spleen qi to sink, preventing it from dispersing essence to reach the lungs (as stated in *Neijing*: "Spleen qi disperses essence to reach the lungs"), thereby causing stagnation in the chest leading to congestion and hardness.

This section provides a detailed outline but omits treatment methods. By synthesizing it with the following section, one can naturally derive the appropriate treatment.

Original text from *Shanghan Lun*: In Taiyin wind-stroke, there is painful discomfort in the four limbs. If the pulse is superficially slight (yang micro) and deepbound (yin choppy) yet long, recovery is imminent.

Tang Rongchuan stated: This section discusses Taiyin wind-stroke. If the pulse were superficially large and deeply slippery, the pathogen would be strong and sinking inward. Now, since the superficial pulse is not large but slight, and the deep pulse is choppy yet long, we know that "slight and choppy" indicates the pathogen is not strong, rather than deficiency of healthy qi. A "long" pulse indicates sufficient healthy qi; thus, the slight and choppy quality is not a concern, indicating impending recovery.

A patient, just reaching adulthood, during mid-spring, suffered from latent heat transforming into fire and invading Taiyin. He experienced abdominal distension, mental restlessness, and swelling and pain in both hands. His pulse was large and soggy (ru), with the two chi positions feeling solid upon heavy pressure. I reasoned that the abdomen is the region of Taiyin; abdominal distension indicates Taiyin pathology. The fu-organ of Taiyin is the spleen, which governs the four limbs. Since latent heat invaded Taiyin, both hands swelled and hurt. The feet remained unaffected because the invading pathogen was heat, and heat tends to ascend; hence, the hands were diseased while the feet were not. Because the pathogen was heat, he felt restless. Recalling the statement in the Taiyin chapter of *Shanghan Lun*: "In Taiyin wind-stroke, painful discomfort in the four limbs, with a superficially slight, deeply choppy, and long pulse, indicates impending recovery," I noted that the pulse presented in this case was exactly opposite to the pulse indicating recovery. Therefore, careful consideration of treatment was necessary. I prescribed a formula using raw Radish Seed (Laifuzi) and raw Chicken Gizzard Lining (Jineijin), each 3 qian, to relieve distension; Talcum (Huashi) and raw Hang Shao Yao (Paeonia lactiflora), each 6 qian, to clear restlessness; Green Forsythia Fruit (Lianqiao) and raw Polygonum multiflorum seed powder (Puhuang), each 4 qian, to cure hand swelling and pain. After two doses decocted and taken according to the prescription, all ailments resolved. Indeed, Taiyin disease originates from damp-heat. The damp-heat stagnating upward was resolved via slight sweating after taking this decoction, while the damp-heat sinking downward was resolved via diuresis. If one were to apply this case's formula to treat the disease described in the previous section, adding 3 qian of processed Pinellia Rhizome (Banxia) would stop the upper vomiting, and adding 8 qian of raw Dioscorea Rhizome (Shanyao) would cure the lower diarrhea. Moreover, the Lianqiao and Puhuang in the formula, besides treating hand swelling and pain, would also alleviate abdominal pain. By slightly increasing the ingredients in this formula to treat the disease in the previous section, it could be cured readily.