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Zhang Zhongjing stated that Shanghan (Cold Damage) comprises five types. Its differentiation should begin with the differentiation of Taiyang disease (diseases caused by pathogenic factors affecting the Taiyang channel). However, there are indeed cases where the disease does not necessarily originate from Taiyang. Furthermore, even if it originates from Taiyang, there are instances of transmission and non-transmission. Zhang Zhongjing regarded a quiet disease state as non-transmission. If the pathogen transmits to the Stomach, it ceases further transmission. Even within the process of channel transmission, one cannot rigidly adhere to the notion that Yangming disease (diseases caused by pathogenic factors affecting the Yangming channel) must follow Taiyang. There are cases transmitting directly from Taiyang to Shaoyang disease (diseases caused by pathogenic factors affecting the Shaoyang channel), or from Taiyang directly to the Three Yin channels (Taiyin, Shaoyin, Jueyin). There are cases transmitting from Taiyang without involving Yangming but instead to the Fu organ of Taiyang (the Bladder). Moreover, within Fu organ transmission, some transmit to the Qi level (functional aspect), while others transmit to the Blood level (material aspect). There are also cases not originating in Taiyang but transitioning from Yangming to Taiyang, or from Shaoyang to Taiyang. Additionally, there are cases of direct invasion into the Yin channels (cold pathogens directly invading the Three Yin channels), recovery from Yin channels returning to Yang channels, simultaneous transmission of Yin and Yang channels, Yang patterns resembling Yin patterns, and Yin patterns resembling Yang patterns. These variations are too numerous to count. One cannot be constrained by the number of days; rather, one should seek clues based on exterior-interior and Fu-Zang relationships. For instance, if interior patterns (internal organ pathology) appear within one or two days, there is absolutely no rationale for using diaphoretic methods (sweating therapy); if exterior patterns persist after five or six days, there is absolutely no rationale for using purgative methods (draining downward therapy). When interior patterns are more urgent than exterior ones, treat the interior first, then the exterior; when exterior patterns are more urgent than interior ones, treat the exterior first, then the interior. Zhang Zhongjing’s discussions are clear as day. Understanding this method of flexible variation renders the erroneous doctrine of "diaphoresis followed by purgation" obviously false without further explanation.

The teachings of Tao Hua (styled Jie'an) have been prevalent in the world for a long time. People claim that Zhang Zhongjing's scholarship became prominent only through Tao Jie'an. I argue that Zhang Zhongjing's works were subsequently neglected due to Tao Jie'an. This is not a harsh critique. Tao Jie'an devoted his lifelong energy to studying Zhang Zhongjing's *Treatise on Cold Damage*, expending considerable effort, yet ultimately his views were overshadowed by Wang Shuhe (the physician who compiled and edited the *Treatise on Cold Damage and Miscellaneous Diseases*). Consequently, his discussion of Shanghan still identifies it as the "correct cold" contracted in winter, using Guizhi Tang (Cinnamon Twig Decoction) and Mahuang Tang (Ephedra Decoction) specifically to explain winter correct cold damage. Regarding warm diseases and heat diseases, he still analyzed illnesses according to solar terms. This merely follows the precepts of the *Preface*, showing that his foundational功夫 (effort/skill) in differentiating Shanghan at the outset was not thorough. His classification of Six Channel differentiation forcibly incorporated the *Neijing* (Inner Canon) method for hot diseases, mixing it indistinguishably with Zhang Zhongjing's Shanghan methodology. His discussion on pulse diagnosis is particularly debatable. Zhang Zhongjing's primary method for identifying diseases relies entirely on the mutual reference of pulse and symptoms to ascertain the etiology accurately. The chapters on Differentiating Pulses and Calming Pulses in his work are subtle and profound; how could one penetrate their mysteries without deep spiritual contemplation? Furthermore, his pulse methods scattered throughout the Six Channel chapters must be understood in conjunction with specific symptoms. Tao Jie'an, however, claimed that one need only rely on the Floating, Middle, and Sinking positions of the three pulses, and whether they are forceful or feeble under the fingers, to differentiate exterior-interior, Yin-Yang, cold-heat, and deficiency-excess. Little did he know that this is merely the general outline of pulse taking, insufficient to exhaust the variations of pathological conditions. Most absurdly, he asserted that Xiaochaihu Tang (Minor Bupleurum Decoction) could universally treat epidemic warm diseases and seasonal disorders, adding Jiedu Tang (Detoxification Decoction) for severe heat, without needing to examine the pulse. Such diseases would naturally resolve with sweating and cooling after one seven-day cycle, or two or three cycles. If one believes this, there is no need to differentiate which channel or pattern is involved, nor to examine the three pulse positions or their forcefulness. One simply uses Xiaochui Tang and waits for spontaneous recovery after a prolonged period. Once this theory is established, mild cases may take longer to recover, and severe cases may become incurable even with later treatment. Yet this book became popular in later generations precisely because people avoid difficulty and seek ease; who would not gladly follow such a simple method? In his preface, Tao Jie'an stated that future colleagues need only study this book carefully and need not collect miscellaneous prescriptions or read other treatises, clearly teaching people not to re-read Zhang Zhongjing's works. Consider how could Zhang Zhongjing's profound insights be fully elucidated? Even if one diligently teaches others to learn from Zhang Zhongjing, people still fear difficulty and hesitate. Now, the collected prescriptions and theories in this book, even if thoroughly exhaustive, merely pick up dregs while discarding the essence. Is it not better to eagerly pursue the source of Zhang Zhongjing? As the saying goes: "Aim high, and you may reach the middle." To learn Shanghan, apart from Zhang Zhongjing, whom else can one turn to?