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"Huang" refers to a sallow and puffy complexion; "Dan" refers to the five types of jaundice. The *Jin Gui Yao Lue* (Essential Prescriptions from the Golden Cabinet) originally distinguished between "various Huang" and "various Dan," but the discussion on Dan is detailed while that on Huang is brief, leading readers to easily confuse them. Consequently, they mistakenly assume that all "Huang" corresponds to "Huang Dan" within the five types of Dan. Examining the disease manifestation section on yellow diseases in the *Zhu Bing Yuan Hou Lun* (Source Book of All Categories of Pathogenesis), which spans 146 characters from the name of the yellow disease to its treatment, lists symptoms very meticulously. This must be based on the lost texts of the *Jin Gui Yao Lue*. Why do I say so? Body ache, fever, dry eyes, nasal pain, stiffness in both upper arms and neck, and tightness in the lower back are exterior syndromes of the Taiyang and Yangming channels. In the *Jin Gui Yao Lue*, there is a clause stating: "For patients with jaundice whose pulse is floating, sweating should be induced, and Guizhi Jia Huangqi Tang (Cinnamon Twig plus Astragalus Decoction) is appropriate." The symptoms and treatment correspond perfectly. Dry and difficult defecation indicates a Yangming stomach-fullness excess syndrome. In the *Jin Gui Yao Lue*, there is another clause: "Various types of jaundice are treated with Zhigao Fa Jian (Pork Fat and Human Hair Decoction)." Here too, the symptoms and treatment correspond. Since the *Jin Gui Yao Lue* details the treatments, it should not omit the symptoms; thus, I suspect that Chao Yuanyuan's theory was based on the lost texts of the *Jin Gui Yao Lue*. Furthermore, inferring from this, Huang disease naturally shares therapeutic methods with Shanghan (Cold Damage), hence jaundice often occurs in Shanghan cases. If we consider "Huang Dan" among the five types of Dan, it belongs to miscellaneous diseases like the others, and certainly does not allow for the initial treatment using Shanghan methods as Huang disease does; this is the distinction. Chao Yuanyuan listed "Huang Dan" separately from Huang disease, grouping it with Nü Lao Dan (Jaundice due to Sexual Exhaustion), Jiu Dan (Alcoholic Jaundice), Gu Dan (Grain Jaundice), and Hei Dan (Black Jaundice). He incorporated passages regarding Huang Dan from the *Ling Shu* and *Su Wen*, along with 35 characters from the *Jin Gui Yao Lue* concerning "jaundice accompanied by thirst," into his description of Huang Dan. This differs significantly from the discussion on Huang disease, showing strict differentiation, proving he was indeed a skilled reader of Zhang Zhongjing's works. Later generations mistakenly identified the term "Huang Dan" in the title of the *Jin Gui Yao Lue* as referring specifically to the Huang Dan among the five types, thereby categorizing all mentions of "Huang" in the chapter as such, causing confusion between the treatments for Huang and the five types of Dan. When treatment fails, people claim ancient prescriptions are difficult to use; therefore, one must select the most accurate interpretations when studying classics.

People only know that Huang Dan has Yin and Yang types, but do not understand what Yin and Yang specifically refer to. Upon hearing the word "Yin," they immediately confirm it as a deficiency syndrome without doubt. This applies not only to jaundice but is particularly harmful in the context of jaundice. Jaundice is fundamentally caused by damp-heat; regardless of Yin or Yang type, the correct approach is to treat the damp-heat. If it is truly Yin-type jaundice, the damp-heat has penetrated deeply, indicating a condition more severe than Yang-type jaundice. Administering tonifying agents will trap the damp-heat inside. Although the patient may appear improved temporarily, the root cause of the disease will remain unremoved for life. I have seen many such cases, ultimately irretrievable. Alas! Have people ever considered where the theory of Yin and Yang originates? The *Jin Gui Yao Lue* states: "When jaundice arises from the Yin aspect, the person will vomit; when it arises from the Yang aspect, the person will experience chills followed by fever." Thus, the distinction between these two types of jaundice lies in the depth of the pathology, not in the deficiency or excess of Qi. "Yin" here refers to the Zang organs, specifically the Lung; "Yang" refers to the Six Channels, specifically the Three Yang channels. Zhang Zhongjing's writings contain such examples. For instance, in Shanghan, fever with aversion to cold arises from the Yang, while absence of fever with aversion to cold arises from the Yin; sore throat with facial redness and macules is Yang Du (Yang Toxin), while dark complexion with body pain is Yin Du (Yin Toxin). These are all instances of this principle. Later generations failed to comprehend this meaning. Whenever encountering the term "Yin Syndrome," they either treated it as Cold using Hot herbs or as Deficiency using Tonics. Since the Yuan and Ming dynasties, this has been common. Zhang Jingyue often formulated tonifying prescriptions for Yin-type jaundice. Did he intend to harm people? No, he merely mistook the temporary trapping of damp-heat for rapid efficacy, failing to foresee the true brilliance and foresight required to prevent future relapse. The *Da Xue* (Great Learning) emphasizes the pursuit of ultimate knowledge; this is indeed true.