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Recently, the condition of Dan Sha (a acute infectious disease characterized by sore throat and skin rash) has been very common among patients, and many have died from it. Because medical texts have not adequately covered this condition, practitioners find themselves at a loss for treatment methods. Some advocate acrid-dispersing methods, some advocate cooling-resolving methods, and some advocate bitter-cold herbs to drain heat. All these approaches are based on subjective assumptions, with each practitioner sticking to their own specialty, without ever exploring the root cause of the disease.

According to Zhang Zhongjing's *Jin Gui Yao Lue* (*Essential Prescriptions of the Golden Cabinet*), "The disease of Yang Du (a category of diseases caused by pathogenic yang-heat toxins) presents with a red face and mottled rashes like brocade patterns, sore throat, and vomiting of pus and blood. If treated within five days, it is curable; if after seven days, it is difficult to cure. Shengma Biejia Tang (Cinnamon Twig and Turtle Shell Decoction) should be used." Carefully analyzing the meaning of this text, it is actually very similar to Dan Sha. Why are there so few people who can grasp its essence?

As for Shengma Biejia Tang, it primarily uses Shengma (Rhizoma Cimicifugae) to ascend and vent toxic pathogens, Biejia (Carapax et Plastrum Testudinis) to clear heat and preserve spirit, Danggui (Radix Angelicae Sinensis) to harmonize blood and regulate Ying (nutritive qi), and Gancao (Radix Glycyrrhizae) to purge fire and detoxify. This aligns perfectly with the principle in *Huangdi Neijing* (*The Yellow Emperor's Inner Canon*): "When heat dominates internally, treat with salty-cold substances, assisted by sweet-bitter ones." The formula contains Shujiao (Fructus Zanthoxyli) and Xionghuang (Realgar), which seem more appropriate for Yin Du (Yin toxin) formulas, possibly due to transcription errors during copying. A slight shift in perspective makes the distinction between Yang Du and Yin Du even more precise, reducing hesitation and fear among those using the formula. Therefore, when encountering Dan Sha today, one should carefully examine the classic principles rather than claiming that ancients did not address this condition. Presuming my ignorance, I dare to submit this for discussion with fellow practitioners.

Reading Chapter 42 of *Nan Jing* (*Classic of Difficult Issues*), which discusses the length, weight, width, and capacity of zang-fu organs, I privately believe this is not necessarily accurate. For instance, human body weights and heights vary, as do dietary intakes; thus, generalizations cannot be rigidly applied. Even if there are theories about measuring height by bending the middle finger to measure the middle joint, the actual volume (sheng/he units) of water and grain retained by individuals differs significantly. This shows that when studying texts, we must remain flexible and open-minded, avoiding dogmatic adherence to established doctrines.

In Zhang Jingyue's *Xin Fang Ba Zhen* (*New Formulas of the Eight Arrays*), under the description of Da Wen Zhong Yin (Great Warming Middle Drink), it states: "From nourishing blood to dispersing, achieving the wonder of clouds rising and rain falling, a level Zhang Zhongjing had not reached." I respectfully disagree. In treating cold damage (Shang Han), Zhang Zhongjing used Zhigancao Tang (Prepared Licorice Decoction), containing Guizhi (Ramulus Cinnamomi Cassiae), wine, Dihuang (Radix Rehmanniae Preparata), Maidong (Rhizoma Ophiopogonis), Ejiao (Colla Corii Asini), and Mahuang (Herba Ephedrae). Is this not precisely the manifestation of yang rooted in yin, and sweat transforming from fluids—the wonder of clouds rising and rain falling? It cannot be said that Zhang Zhongjing failed to achieve this.