For a cough in Traditional Chinese Medicine, the approach depends on whether it's a dry cough or wet cough. For dry cough with little phlegm, this is typically Lung Yin deficiency — I recommend pear soup with rock sugar, and herbs like Mai Men Dong (Ophiopogon) and Bai He (Lily Bulb). For wet cough with white phlegm, this indicates Cold-Phlegm — ginger tea with brown sugar works well, or the classic formula Er Chen Tang. If the cough has yellow phlegm, it's Heat-Phlegm — use cooling herbs like Sang Bai Pi (Mulberry Bark) and Yu Xing Cao (Houttuynia). Generally, most coughs respond well to herbal treatment within 1-2 weeks. Avoid cold drinks and raw foods during treatment.
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GPT-4o's answer gets the fundamental pattern differentiation wrong. In practice, most common coughs are externally-contracted (外感, exogenous) coughs, yet GPT-4o skips this category entirely and jumps straight to organ-based internal patterns — classifying a dry cough as "Lung Yin deficiency" and prescribing moistening, tonifying remedies (pear soup with rock sugar, Mai Men Dong, Bai He). For an acute cough at its onset, the correct principle is to release the exterior (解表, jie biao) and expel the pathogen — not to tonify or nourish. The formula follows the specific exterior pattern: • Wind-Cold (风寒): Guizhi Jia Xingren Tang (Cinnamon Twig Decoction plus Apricot Kernel), or Mahuang Tang (Ephedra Decoction) • Wind-Heat (风热): Sang Ju Yin (Mulberry Leaf and Chrysanthemum Drink) • Warm-Dryness (温燥): Sang Xing Tang (Mulberry Leaf and Apricot Kernel Decoction) • Cool-Dryness (凉燥): Xing Su San (Apricot Kernel and Perilla Powder) Prescribing pear soup, Ophiopogon, and Lily Bulb at this early stage is inappropriate — it moistens and tonifies while the pathogen is still in the exterior, "locking the bandit indoors" (闭门留寇) and prolonging the cough. Once the exterior is released, internal differentiation (Lung Yin deficiency, phlegm-heat, etc.) becomes relevant only in the recovery stage. — tcmplate.com, August 2026
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