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The *Yin Yang Bie Lun* (Treatise on the Distinctions of Yin and Yang) mentions the "Zigong Bao" (Uterus/Bladder). The *Qi Jue Lun* (Treatise on Qi Reversal) states that "heat from the Bao transfers to the Bladder." The *Wu Wei Pian* (Chapter on Five Flavors) states that the Chong Mai (Penetrating Vessel) and Ren Mai (Conception Vessel) both originate from within the "Bao." In all these instances, the character "Bao" is pronounced as "bao" (package), referring to the **Zigong** (Uterus). The *Ling Shu* (Spiritual Pivot) states: "The Bao of the Bladder is thin and weak." Here, "Bao" is pronounced as "pao," referring to the **Niao Pao** (Urinary Bladder). Although there are two pronunciations for the character "Bao," the written form is identical. Why did later scholars fail to understand its meaning, reading it all as "bao," and consequently, due to the scriptural language, mistaking the Bladder and the Bao as two distinct entities? Thus, in the *Lei Zuan*, it is stated: "The Bladder is the chamber of the Bao." Wang Andao stated: "The Bladder is the Fu organ of Body Fluids." There is also the theory that "the Bao resides in the chamber of the Bladder," which is highly absurd and baseless. In fact, the Bladder is the Pao, and the Pao is the Bladder. How can there be another object residing inside the Bladder? This has caused confusion among later students of medicine.

Diseases of the human body have infinite variations. Their treatment principles are myriad and diverse, and cannot be constrained by a single rule. When Zhu Danxi treated diseases, he generally focused on only three factors: **Qi** (Vital Energy), **Blood**, and **Phlegm**. Among these three, **Yu** (Stagnation) was often involved. For Qi disorders, he used **Sijunzi Tang** (Four Gentlemen Decoction); for Blood disorders, **Siwu Tang** (Four Substance Decoction); for Phlegm disorders, **Erchen Tang** (Two Aged Decoction); and for Yu stagnation, he established **Yueju Wan** (Relieve Depression Pill) as fixed methods. Wang Jiezhai praised this extensively. However, mediocre physicians, imitating mechanically like the people of Handan, came to believe that medical expertise ends here. In truth, Danxi's words were merely a general outline! If one simply says that Qi disorders are treated with Qi-regulating methods, Blood disorders with Blood-nourishing methods, Phlegm disorders with Phlegm-resolving methods, and Yu disorders with Stagnation-relieving methods, then how difficult would it be to practice medicine?

In the *Jin Gui Yao Lue* (Essential Prescriptions of the Golden Cabinet), regarding hematochezia (blood in stool), bleeding before defecation is classified as **Jin Xue** (Near Blood), and bleeding after defecation as **Yuan Xue** (Far Blood). This classification is based on the timing of blood expulsion, not on the assumption that the source determines nearness or distance (e.g., Heart/Lung vs. Kidney/Liver). Zhu Danxi, however, argued that blood appearing after stool originates from the Heart and Lung; since the Heart and Lung are located superiorly, the blood appears late. Blood appearing before stool originates from the Liver and Kidney; since the Liver and Kidney are located inferiorly, the blood appears early. In fact, the Heart governs Blood, while the Lung governs Qi; the Liver stores Blood, and the Kidney stores Essence. The blood expelled in stool fundamentally results from Damp-Heat injuring the Large Intestine. This blood belongs to the Large Intestine Meridian. Therefore, some patients suffer from this condition for years without wasting away or becoming emaciated. This indicates that the pathogen is Damp-Heat, not bleeding caused by injury to the Four Zang organs. If the Four Zang organs were injured, causing frequent and uncontrolled bleeding, it would inevitably lead to damage of the Heart and Lung (manifesting as sallow complexion) and damage of the Liver and Kidney (manifesting as physical emaciation). Could such a condition be considered harmless? Therefore, using the sequence of blood expulsion to distinguish between Near and Far blood is acceptable, but attributing the blood specifically to the Heart/Lung or Liver/Kidney based solely on this sequence is overly speculative and forced.