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The most critical aspect of Cold pathogen diseases lies in the concepts of Exterior (Biao) and Interior (Li). Within these, there are distinctions between those complicated by Wind (Feng) or Dampness (Shi). Wind-Cold diseases affect the Taiyang Channel (Taiyang Meridian), while Damp-Cold diseases affect the Taiyin Channel (Taiyin Meridian). Latent Qi diseases (diseases caused by pathogens lying dormant in the body) are treated via the Shaoyin Channel (Shaoyin Meridian), whereas common colds (exogenous warm diseases) are treated via the Shaoyang Channel (Shaoyang Meridian). However, if adhering strictly to the theory of Root and Branch (Ben-Biao), it is primarily the Shaoyin and Taiyang channels that govern this type of pathogenic Qi. The Taiyin channel also frequently involves such diseases. As for the Shaoyang, Yangming, and Jueyin channels, even when they involve Cold pathogen diseases, they often transform into Heat; therefore, Harmonizing methods (He Jie) may be applied. This should be cross-referenced with the theory of the Six Qi (Wind, Cold, Summer-heat, Dampness, Dryness, Fire) mentioned earlier.

Regarding theories on Warm-Thermal diseases, Ye Tianshi (courtesy name Xiangyan) explored their origins. Chen Pingbo traced the evolution of the distinction between Wind-Damp diseases. Later, Wu Jutong (Wu Tang) followed Ye’s medical cases and authored *Wen Bing Tiao Bian* (Systematic Differentiation of Warm Diseases). Wang Mengying (Wang Shiyong) modeled his work after Chen Pingbo and compiled *Wen Re Jing Wei* (Classic and Standard Texts on Warm-Heat Diseases). Books on treating Warm diseases are already abundant. However, Wu Jutong delineated boundaries according to the San Jiao (Triple Burner), yet failed to fully elucidate the mechanism of latent Qi, which is a lapse by a wise man, truly regrettable for both gentlemen. Now, I divide Wind-Damp into two parts, citing predecessors' words to clarify their meanings, hoping to provide a lamp in the long night so as not to leave blind men groping in the dark.

Wu Jutong stated: Wind has Warm and Cold varieties. The wind in Wind-Cold comes from the North; it is a chilling wind that triggers disease. It is most adept at contracting and pulling inward. When Yin is excessive, it inevitably damages Yang. Thus, it first stagnates the Yang Qi within the Taiyang Channel, leading to symptoms such as headache and fever. Taiyang belongs to the Yang Fu organs (Yang Bowels), while Cold Injury belongs to Yin pathogens. Excessive Yin damages human Yang, hence it is called Wind-Cold. The wind in Wind-Warmth comes from the East; it is a warming wind that thaws ice. It is most adept at dispersing and venting outward. When Yang is excessive, it inevitably damages Yin fluids. Thus, it first stagnates the Yin Qi within the Taiyin Channel, leading to symptoms such as cough, spontaneous sweating, thirst, headache, and fever. Taiyin belongs to the Yin Zang organs (Yin Viscera), while Warm-Thermal pathogens belong to Yang pathogens. Excessive Yang damages human Yin, hence it is called Wind-Warmth.

Zi Yuyu stated: There are three causes for Damp-Warmth diseases. First, the pulse presents as superficial (Yang) soft and weak, and deep (Yin) small and rapid. This indicates prior exposure to Summer-heat followed by Dampness, where Summer-heat steams the Dampness. Symptoms include coldness in both calves, abdominal fullness, pain in the chest, head, and eyes, and delirious speech. Treatment should focus on the Foot-Taiyin Spleen Channel, and sweating methods must not be used. Second, injury to the Spleen occurs first, leading to internal Dampness, where Dampness and Heat contend. The pulse is soft and weak, the tongue coating is white or crimson underneath, there is vomiting and regurgitation, dry mouth, inability to drink water, chest fullness and oppression, tidal fever, sweating brings slight relief but heat returns shortly after. This occurs between the Spring Equinox and Autumn Equinox, when the Ministerial Fire of Shaoyin, the Host Fire of Shaoyang, and the Damp Earth of Taiyin act together. Combined with hot air descending and damp air ascending, inhaled through the nose and mouth, it attaches to the Stomach and Spleen. Misdiagnosis leads to complications that cannot be exhaustively listed. Third, Dampness comes from outside, affecting the Qi level of the Upper Jiao. Symptoms include tidal fever and spontaneous sweating. If exterior resolution fails and clearing heat is ineffective, ventilating the Qi level is appropriate. If one is exposed to rain and fog, leaving Dampness in the Taiyin, with fever in the muscle and surface, spontaneous sweating, no thirst, no desire to drink, grey-white sticky tongue coating, and despite body heat, a reluctance to remove clothes and blankets, resolving the muscle layer and harmonizing the exterior is appropriate. If the syndrome differentiation is unclear, failure is almost inevitable.