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Taiyang disease (disease of the Taiyang channel) after five or six days presents with sweating on the head, slight aversion to cold, cold hands and feet, fullness in the epigastrium, anorexia, hard stools, and a fine pulse. This is termed "Yang Wei Jie" (mild constriction of Yang Qi). There must be both exterior and interior syndromes. A deep pulse indicates the pathology is interior. Sweating occurs due to mild Yang constriction.

If it were purely Yin constriction, there would be no exterior symptoms remaining; all manifestations would be interior. This would indicate the disease is entirely interior. Since there are now exterior symptoms, it indicates the disease is half-exterior and half-interior. Although the pulse is deep and tight, it cannot be diagnosed as Shaoyin disease (disease of the Shaoyin channel). The reason is that Shaoyin disease typically does not present with sweating. Since only the head is sweating, we know this is not Shaoyin disease.

Xiao Chai Hu Tang (Minor Bupleurum Decoction) may be administered. If the patient remains uncomfortable after taking it, recovery will occur upon defecation.

Taiyang disease after five or six days presents with sweating on the head, slight aversion to cold, cold hands and feet, fullness in the epigastrium, anorexia (silent desire for no food), hard stools, and a fine pulse (encompassing deep and tight qualities). This represents mild constriction in the Yangming channel.

Because the Qi stagnation of both the Shaoyang and Yangming channels forces and knots at the stomach opening, there is epigastric distension. Heat steaming from the channels causes sweating on the head. There must be Shaoyang exterior symptoms, such as sweating, aversion to cold, cold limbs, and epigastric fullness; and Yangming interior symptoms, such as hard stools. Generally, when Shaoyang and Yangming diseases combine, Wu Earth (Spleen/Stomach Qi) fails to control Jia Wood (Gallbladder/Liver Qi), so the pathology inevitably transmits to the Yangming Stomach Fu organ, ensuring interior symptoms. A deep pulse indicates interior pathology; sweating indicates mild Yang channel constriction. If it were purely Yin compartment constriction (here, "Yang" refers to the Shaoyang channel, and "Yin" refers to the Yangming Fu organ), there would certainly be no exterior symptoms like sweating or aversion to cold; all would manifest as interior signs. Since exterior symptoms exist, it indicates the disease is half-interior and half-exterior.

Although the pulse is deep and tight, it cannot be diagnosed as Shaoyin disease. The reason is that Shaoyin disease should not have sweating. Since only the head is sweating, we know this is not Shaoyin but actually Shaoyang disease. This falls under the category of Da Chai Hu Tang (Major Bupleurum Decoction) syndrome. First, administer Xiao Chai Hu Tang to resolve the Shaoyang channel pathogen. If discomfort persists after administration, use Cheng Qi Tang (Order the Qi Decoction) variants to drain the Yangming Fu pathogen, and recovery will occur upon defecation.

Taiyang disease exceeding its stage by more than ten days presents with nausea/desire to vomit, chest pain, loose stools, mild abdominal fullness, depression, and slight irritability. If the patient had previously undergone extreme emesis or purgation at that time, Tiao Wei Cheng Qi Tang (Regulate the Stomach Order the Qi Decoction) [Formula found in Yangming Chapter 20] may be used. If not, it should not be used. Symptoms of mere desire to vomit, chest pain, and loose stools do not constitute a Chai Hu syndrome. The presence of vomiting indicates it was caused by previous extreme emesis or purgation.

Taiyang disease exceeding its stage by more than ten days should no longer be in the Shaoyang phase. However, symptoms of nausea/desire to vomit, chest pain, loose stools, mild abdominal fullness, depression, and slight irritability resemble Shaoyang Chai Hu syndrome (this presentation results from Stomach Earth being pressured by Gallbladder Wood). How can a Shaoyang syndrome persist for so long? If the patient had previously undergone extreme emesis or purgation, this represents Shaoyang transmitting to Yangming. The Shaoyang channel syndrome is mild, while the Yangming Fu syndrome has formed. Tiao Wei Cheng Qi Tang may be used without Chai Hu agents. When Shaoyang transmits to Yangming, channel pressure on Fu organs causes constriction, typically presenting with vomiting and diarrhea, i.e., Da Chai Hu Tang syndrome. When vomiting and purgation are severe, it is precisely the time when both Shaoyang and Yangming channels and Fu organs are affected; thus, Da Chai Hu Tang combines Chai Hu and Cheng Qi agents to simultaneously resolve channel and Fu pathogens. Here, since extreme emesis/purgation occurred first, only residual desire to vomit and loose stools remain, representing residual Shaoyang waves. Therefore, Chai Hu agents are not used, but Cheng Qi agents are. If these symptoms did not arise from self-induced extreme emesis/purgation, it would be a Taiyin syndrome (disease of the Taiyin channel characterized by Spleen Yang deficiency), and Cheng Qi Tang should not be used. We know it stems from prior emesis/purgation because today's desire to vomit and loose stools show that Shaoyang residual waves are still present.