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Shengshengzi said: Ancient texts state: "Ke" (cough with sound) refers to coughing with sound but no phlegm, indicating damage to Lung Qi and lack of clarity. "Sou" (cough with phlegm) refers to coughing with phlegm but without sound, caused by Spleen dampness stirring up phlegm generation. The modern term "Ganke" (cough) refers to a condition presenting with both sound and phlegm. However, the etiology is not singular; there are Zang-organ coughs, Fu-organ coughs, Six-Evils coughs, deficiency coughs, excess coughs, water-retention coughs, and fire-coughs, varying greatly in type and requiring different medications. Observing ancient prescriptions, much emphasis was placed on treating the Lung. Methods included clearing the Lung, protecting the Lung, astringing the Lung, draining the Lung, and tonifying the Lung. These five approaches are based on the fact that the Lung belongs to Metal and governs voice production. Only the Lung externally unifies the skin and hair, serving as the body's defense, and internally acts as the Canopy, the most honored organ among the Five Zang organs. The Lung receives the convergence of all meridians; thus, diseases often affect the Lung. If the Lung were not affected, how could coughing occur? Therefore, treating cough must involve the Lung. Regarding methods such as clearing phlegm and descending fire, moistening dryness, tonifying the Kidney, and dispersing wind, Zhu Danxi's *Danxi Zuanyao* explains them most clearly, with detailed categorization and treatment protocols; however, it focuses more on Sou and less on Ke. Scholars should expand upon this foundation to grasp the majority of the principles.

Shengshengzi said: Zhu Danxi stated: "Xiao (wheezing/asthma) is primarily caused by phlegm and is suitable for emetic therapy. There are also cases of deficiency where emesis is contraindicated; in such cases, diet must be bland. One must not use purely cold and cooling herbs but must combine them with exterior-dispersing agents." This reflects a deep understanding of the disease pathology. Among these, some individuals suffer from childhood due to consuming sour and salty flavors, which either damage the Spleen or invade the Lung, leading to phlegm accumulation in the airways. Over time, heat generates, obstructing the ascending and descending mechanisms, resulting in Xiao syndrome. Upon exposure to Wind-Cold, the condition flares because the Lung combines with the skin and hair; external constriction by Wind-Cold prevents the release of internal heat, causing internal heat to stagnate and郁结 (become congested). New phlegm is generated, causing old phlegm to erupt simultaneously. Consequently, there is rapid breathing and wheezing, shoulder lifting and neck stiffening, inability to lie supine, red face, headache, aversion to cold, and fever. Treatment should focus on dispersing the exterior. Once the exterior pathogen is resolved and heat dissipates, the airway flows freely, offering temporary relief. Some cases arise from dietary rich flavors damaging the Spleen, impairing transformation and transportation. Spleen damage prevents the distribution of Body Fluids, generating phlegm-drool that blocks the collaterals, making Lung Qi unfavorable, leading to chest fullness, abdominal pain, night sweats, tidal fever, and day-and-night wheezing with sounds like sawing wood. Treatment should involve digesting food, strengthening the Spleen, clearing phlegm, and promoting Qi flow. Other cases result from excessive sexual activity depleting Kidney Water, failing to control Fire descent. Unchecked Fire insults the conquered element (Lung Metal), injuring the Lung. When Lung Metal is damaged, the source of generation and transformation is cut off. Symptoms include afternoon tidal fever, thunderous wheezing, headache, red face, night sweats, irritability, mild symptoms during the day and severe at night, and a rapid yet forceless pulse. Treatment requires tonifying the Kidney to control Fire, clearing Metal, and moistening dryness. Some cases are triggered by rebellious Qi. The *Classic* states: Anger causes Qi to ascend, rising without descending. It also says: Great anger causes Fire to rise from the Liver. Furthermore: Ascending Qi originates from the Liver, carrying Ministerial Fire. Lung deficiency fails to subdue Liver Wood, leading to chest fullness, hypochondriac pain, deafness, red eyes, and breath hot as fire. Treatment should suppress the Liver and regulate Qi. For cases where both Phlegm and Qi are dense, one should employ drastic emetic therapy to extract the root cause. After removing the root, one must quickly tonify Middle Qi. With sufficient Middle Qi, phlegm will not recur.