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Zhang Zhongjing stated: Although the number of days since onset is long, if there are still exterior symptoms (biao zheng) and the pulse is floating (mai fu), sweating therapy (fa han) may still be employed; although the number of days is short, if interior symptoms (li zheng) are present and the pulse is deep and excess (mai chen shi), purgative therapy (xia zhi) is required. Thus, the number of days cannot be rigidly adhered to. Sun Simiao said: After taking Chengqi Tang (Chengqi Decoction, a formula for purging heat and unblocking bowels) results in smooth bowel movement, do not administer tonification midway. If heat is supplemented, it will reconstitute as excess heat; this refers to excess heat (shi re). Wang Shuhe said: Deficient heat (xu re) must not be treated with attacking/purgative methods; if the heat is removed by such means, cold (han) will arise; this refers to deficient heat. The statements of these two individuals differ in approach but converge in conclusion. Thus, the distinction between deficiency and excess is complex. Furthermore, cold (han), warm (wen), and heat (re) pathogens share the same nature but have different names. Summerheat (shu), dampness (shi), and wind (feng) are distinct pathogens yet often cause combined diseases. Different pathogens may succeed one another, and other pathogenic factors may arise simultaneously. There are cases where exterior syndromes preclude sweating therapy, and interior syndromes preclude purgative therapy. The Three Yin syndromes (San Yin) can be treated with warming methods, but treating accumulation syndromes differs. Exterior and interior signs appearing together are distinct from Half-Exterior Half-Interior syndromes (Ban Biao Ban Li) which lack clear exterior-interior differentiation. Pulse and symptom presentations in Cold Damage (Shang Han) and Wind Strike (Shang Feng) interweave. Heat Stroke (Zhong Shu) and Heat Disease (Re Bing) are difficult to distinguish due to their similarity. Yangming disease (Yang Ming Bing) typically presents with profuse sweating, yet may paradoxically present without sweat; Shaoyin disease (Shao Yin Bing) typically presents without sweat, yet may paradoxically present with spontaneous sweating. Extreme Yin conditions may manifest as restlessness (Ji Yin Fa Zao), and extreme Yang conditions may manifest as cold limbs (Ji Yang Fa Jue). Yin syndromes may resemble Yang syndromes, and Yang syndromes may resemble Yin syndromes. A slight error leads to a massive deviation. Additionally, Phlegm disorders (Tan Zheng), Food Stagnation (Shi Ji), Deficiency Vexation (Xu Fan), and Hongjiao (Hongjiao, a disease characterized by lower limb swelling and weakness due to dampness) resemble Cold Damage but cannot be confined to the treatment principles of Cold Damage. Unless one comprehends through mind and intuition, understands change and opportunity, possesses precise recognition, and applies treatments appropriately, how could one handle diverse situations without error?