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When pathogenic factors injure the human body, they first damage Qi (vital energy), then Blood (ying blood), then flesh (muscles and subcutaneous tissue), then sinews (tendons and ligaments), and finally bones. After the pathogenic toxins recede, Qi recovers first, then Blood, then flesh, then sinews, and finally bones. Because those that are soft and brittle are easily damaged, they are also easily recovered.

The heaven tilts to the northwest, and the earth sinks to the southeast; therefore, men are injured on the right side first, and women on the left side first. When recovery occurs, men recover on the left side first, and women on the right side first. Those who are constitutionally deficient are easily damaged, while those who are constitutionally robust are easily recovered.

Yan Zhengfu, aged thirty, after suffering from a pestilential disease, his pulse and symptoms both normalized, and his diet gradually increased. Suddenly, his limbs became edematous, with no other discomfort. This is the manifestation of Qi recovering. Generally, after a severe illness, when Blood has not yet become abundant but Qi suddenly recovers, Blood serves as the foundation for Qi. Since Qi lacks a foundation, edema results. Subsequently, as his diet gradually increased, the edema subsided. If one were to mistakenly administer herbs that promote Qi circulation and drain dampness, it would be an error.

Zhang Defu, aged twenty, suffered from Jin Kou Li (dysentery with inability to eat). Day and night without limit, his body was reduced to skin and bone. Although the dysentery had decreased, he could not consume any food at all. He was given a decoction of one qian of Renshen (Ginseng Radix et Rhizoma). Within less than two hours of ingestion, his body suddenly became edematous, like an inflated balloon. Afterwards, his diet gradually increased, the edema subsided, and muscle tissue began to form in the previously swollen areas.

If, after a severe illness, the San Jiao (Triple Burner) is injured and cannot regulate water passages, transmitting fluids downward to the Bladder, resulting in limb edema, this is Shui Qi (Water Qi/Water retention). This is completely different from Qi recovery. It is appropriate to use Shen Qi Wan (Kidney Qi Pill) or Shen Qi Jian (Kidney Qi Decoction) from *Jin Gui Yao Lue* (Essential Prescriptions from the Golden Cabinet). If one mistakenly uses herbs that promote Qi circulation and drain dampness, the condition will surely worsen. In cases of Water Qi, the feet are cold and the limbs feel heavy; in cases of Qi recovery, the feet are not cold, and the limbs feel light. This is the distinction.

Yu Guiyu, aged forty, suffered from paralysis-like weakness in all four limbs after a pestilential disease. Several days later, his right hand began to move. Three more days passed before his left hand moved. The same pattern was observed in the wife of Yu Guigang.

All orifices are the doors and windows of the human body. Pathogenic factors enter through the orifices and invariably exit through them. The *Classic of Medicine* (*Huangdi Neijing*) states: "If the pathogen has not entered the Fu organs, it can be resolved by sweating; if it has already entered the Fu organs, it can be resolved by purging." Master Ma further added the methods of sweating, vomiting, and purging. These methods all serve to guide the pathogen out through the orifices/doors. They constitute the general outline of treatment methods; anything else is merely treating the branch (symptoms) rather than the root. Currently, pestilential diseases present with heat throughout their course. Why is there no mention of clearing heat? This is because we understand that fever arises from the pathogen. By treating the pathogen, the fever resolves spontaneously without directly targeting the heat. The relationship between pathogen and heat is like form and shadow; they depend on each other. Where the form perishes, the shadow cannot exist alone. If one uses purely cold and cooling formulas such as Huanglian Jiedu Tang (Coptis Decoction for Resolving Toxicity) or Huanglian Xiexin Tang (Coptis Decoction for Draining the Heart), gathering only cold-natured herbs to focus solely on clearing heat, lacking the ability to induce sweating, vomiting, or purging, how can one expel the pathogen through the orifices? This is forgetting the root and merely treating the branch. What difference is there from a child trying to catch a shadow?