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These few herbs, along with Tian Dong (Asparagi Radix) and Mai Dong (Ophiopogonis Radix), Gua Lou Ren (Trichosanthis Semen), Tian Hua Fen (Trichosanthis Radix), and Zhi Mu (Anemarrhenae Rhizoma), which possess cold and slippery properties, are often rigidly regarded by contemporary physicians as universal remedies for cough. They fail to distinguish between exterior and interior, deficiency and excess conditions, often leading to fatal errors. The Classics state: "The five zang organs and six fu organs can all cause cough." It also states: "Each of the five zang organs contracts disease in its respective season; if it is not that season, the pathogenic factor is transmitted to it." This indicates that cough is not solely located in the lung. Cough (ke) and phlegm-rattling (sou) are essentially the same, yet sou has distinctions between internal and external origins. Therefore, when pathogens enter from the exterior, they are the six climatic exuberances (liu yin) that first lodge in the lung, termed external contraction (wai gan). Such cases should be treated with the aforementioned acrid-warm herbs to disperse them. Pathogens entering from the exterior must exit through the exterior; it is most taboo to use bitter-cold, astringent, or binding agents, which cause pathogenic factors to linger and not depart, eventually transforming into other syndromes over time. This is akin to locking the door while trying to drive out thieves. Conversely, when symptoms manifest from the interior, they stem from seven emotions, fatigue, or sexual indiscretion causing visceral deficiency, termed internal injury (nei shang). Some develop tuberculosis-like consumption (lao) due to chronic cough, while others suffer cough due to consumption. There are four primary etiologies: First, injury to left kidney essence and water deficiency, leading to fire scorching metal (lung), causing cough; these require sweet-ping (neutral) moistening agents. Second, deficiency of spleen earth failing to generate metal (lung), complicated by phlegm, causing cough; these require acrid-sweet-warm nourishing agents. Third, depression of fire in the heart, lung, and stomach meridians, causing cough; these require bitter-sweet-cool clearing agents. Fourth, decline of ministerial fire (ming men) and inherent deficiency of primordial qi, leaving lung metal unprotected against invasion; these require sweet-hot-warm tonifying agents. Pathogens originating internally, though manifesting externally, cannot be treated merely as external diseases. It is most taboo to use the aforementioned acrid-dispersing and bitter-cold agents, which drain yang and descend yin, inviting external pathogens. This is akin to opening the door to invite thieves. Furthermore, cases initially classified as external contraction may suffer both internal and external damage due to mismanagement; such cases require simultaneous tonification and dispersion, focusing on supporting the middle jiao. If one focuses solely on dispersal, pores open excessively, leading to sweat collapse and worsening condition. Additionally, elderly patients with phlegm-cough and deficient primordial qi cannot tolerate harsh purgative treatments; warm nourishment is essential, possibly combined with symptomatic treatment, though complete cure is difficult. Stability without critical danger is the goal. Generally, if the six pulses are floating and moderate or accompanied by surging and slippery qualities, with normal complexion and form, and unchanged appetite, the prognosis is treatable. However, if the pulse is wiry, rapid, fine, and hurried, with gradual muscle wasting, diarrhea, poor appetite, inability to lie flat, and increasing dyspnea, death is inevitable according to the disease progression. Treating illness is inherently difficult, but treating cough is particularly challenging; those who grasp the nuances may save half of ten cases. Bai He (Lilii Bulbus) is a neutral and moistening herb with no extraordinary efficacy, mentioned only occasionally in dietary texts. Jie Geng (Platycodonis Radix) is neutral in nature and light in quality, capable of carrying medicinal properties upward, serving the function of a "boat and oar" (guiding action upwards).