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1. Cough caused by external contraction, regardless of the season, is invariably due to Cold pathogen (Han Xie), as Cold enters the Lung (Fei) along with the seasonal Qi, thereby inducing cough. Treatment should employ Pungent-Warm (Xin Wen) methods to disperse the pathogen naturally; among these, Liu'an Decoction (Liu'an Jian) with added Fresh Ginger (Sheng Jiang) is most excellent.

For all cases of cough due to external contraction, it is appropriate to first use this decoction with modifications as the primary formula. If there is dryness and astringency in the Lung and epigastrium, with obstructed Phlegm-Qi, or if the patient is elderly with declining Blood, experiencing laborious coughing, add Dang Gui (Angelicae Sinensis Radix) 2-3 qian to the base formula. If Cold pathogen is excessively strong, or Middle Jiao Cold causes Lung Qi to be unwarmed such that the pathogen cannot be resolved, add Bei Xi Xin (Asari Radix) 7-8 fen or 1 qian to this formula. In winter, when Cold is severe and Qi is closed, making the pathogen difficult to disperse, both Ma Huang (Ephedrae Herba) and Gui Zhi (Cinnamomi Ramulus) may be added, or Xiao Qing Long Tang (Minor Blue Green Dragon Decoction) may be used. If Wind Strike presents with Cold signs, or Cold Damage presents with Wind signs, accompanied by alternating chills and fever and incessant coughing, Chai Chen Jian (Chai Chen Decoction) is indicated. If the Cold pathogen is not severe and Phlegm-Qi is scant, treating solely with Er Chen Tang (Two-Cured Decoction) with modifications will ensure recovery.

1. For cough due to external contraction, individuals with Yin deficiency and Blood insufficiency, or those with Spleen-Lung Deficient-Cold constitutions, are most susceptible to pathogens. Observe if the pulse is slightly weak and the chest/diaphragm lacks stagnation, or if Kidney Qi is insufficient causing Water overflow into Phlegm, or if there is mental restlessness, nausea/vomiting, hunger without desire to eat, or if the patient has reached middle age decline with gradually weakening Qi and Blood, yet cough persists, all such cases should be treated primarily with Jin Shui Liu Jun Jian (Golden Water Six Gentlemen Decoction) with modifications, which deserves the title of a miraculous formula. If accompanied by Qi deficiency in the Yang aspect, manifesting as faint pulse, spiritual fatigue, reluctance to speak, and profuse sweating, Ren Shen (Ginseng Radix et Rhizoma) must be added without hesitation; if the issue is merely Spleen Earth deficiency failing to generate Lung Metal, preventing pathogen resolution, Liu Jun Zi Tang (Six-Gentlemen Decoction) should be used to tonify Spleen and Lung; or if Spleen deficiency fails to control Water, leading to Phlegm overflow, Li Zhong Tang (Regulate the Middle Decoction), or Li Yin Jian (Nourish Yin Decoction), or Ba Wei Wan (Eight-Ingredient Pill) may be used to tonify the Mother organ (Spleen Earth); these are all sound methods.

1. External cough accompanied by Fire pathogen necessarily presents with internal heat, preference for cold drinks, and slippery pulse. Treat primarily with Er Chen Tang or Liu'an Jian, adding cooling herbs as adjuvants: for mild heat, add Huang Qin (Scutellariae Radix) 1-2 qian; for severe heat, additionally add Zhi Mu (Anemarrhenae Rhizoma) and Zhi Zi (Gardeniae Fructus). If Fire is in the Yangming channel accompanied by headache, fever, and thirst, Shi Gao (Gypsum Fibrosum) is most appropriate.

1. In external contraction diseases, Spring features ascending and floating Qi; treatment should incorporate descending agents such as Ze Xie (Alismatis Rhizoma), Qian Hu (Peucedani Radix), Hai Shi (Fossilia Osseum), and Gua Lou (Trichosanthis Fructus). Summer features hot and scorching Qi; treatment should incorporate cooling agents such as Huang Qin (Scutellariae Radix), Lian Lian (Coptidis Rhizoma), Zhi Mu (Anemarrhenae Rhizoma), and Bai Zhu (Atractylodis Macrocephalae Rhizoma - *Note: Text says Bai Zhu but context implies Bai Xie/Bai Hu? Actually text says "Bai" likely referring to Huang Bo or similar, standard interpretation often includes Huang Bo here, but strictly translating text "Bai" usually refers to Bai Zhu or Bai Xian Pi, however in context of cooling summer heat, it likely implies Huang Bo or similar bitter-cold herbs. The text lists "Qin, Lian, Zhi, Bai". In TCM context for clearing heat, "Bai" often refers to Huang Bo (Phellodendri Cortex) or sometimes Bai Tou Weng, but given the list, it's likely a shorthand for a bitter-cold herb. I will translate as "Bai [Herb]" or infer Huang Bo based on standard pairing, but strict translation requires caution. Let's stick to the literal "Bai" implying a specific herb mentioned in context, often interpreted as Huang Bo in this specific grouping in Zhang Jingyue's works, or potentially Bai Xian Pi. However, WHO standards prefer precise names. Given "Qin, Lian, Zhi", "Bai" is almost certainly Huang Bo (Phellodendri Cortex) in this classical context of clearing heat/fire. I will use Huang Bo (Phellodendri Cortex) with a note or just translate as the herb name provided in context. Actually, looking at Zhang Jingyue's style, he often abbreviates. I will translate as "Huang Bo (Phellodendri Cortex)" assuming standard medical context, or keep generic if unsure. Let's look at Autumn: "Cang Zhu, Bai Zhu, Gan Jiang, Xi Xin". Winter: "Fang Feng, Zi Su, Gui Zhi, Ma Huang". So "Bai" in Summer likely parallels "Bai Zhu" in Autumn? No, Bai Zhu is damp-drying. For Summer Heat, one needs cooling. It is highly likely Huang Bo. I will translate as Huang Bo (Phellodendri Cortex)).* Correction: In many editions, this line reads "Qin, Lian, Zhi, Bai" where Bai refers to Huang Bo. I will use Huang Bo (Phellodendri Cortex).

Autumn features yin and damp Qi; treatment should incorporate drying agents such as Cang Zhu (Atractylodis Rhizoma), Bai Zhu (Atractylodis Macrocephalae Rhizoma), Gan Jiang (Zingiberis Rhizoma), and Xi Xin (Asari Radix). Winter features Wind-Cold Qi; treatment should incorporate dispersing agents such as Fang Feng (Saposhnikoviae Radix), Zi Su (Perillae Folium), Gui Zhi (Cinnamomi Ramulus), and Ma Huang (Ephedrae Herba). The Classics state "harmonizing the annual Qi to maintain Heavenly Harmony," referring to such principles. Although seasonal Qi must be known, the nature of the disease pathogen must be examined even more carefully. If the season does not match the disease, or if seasonal symptoms do not align with the clinical presentation, one must abandon the seasonal consideration and follow the syndrome. Regarding the Qi of various Zang organs, if syndromes present concurrently, treatment must be adapted accordingly; thus, one must not adhere rigidly to fixed rules.

1. Cough that recurs every autumn and winter is due to Cold enveloping Heat. Resolving the Cold will naturally dissipate the Heat. Suitable formulas include Liu'an Jian (Liu'an Decoction), Er Chen Tang (Two-Cured Decoction), and Jin Shui Liu Jun Jian (Golden Water Six Gentlemen Decoction); select appropriately based on the patient's deficiency/excess, robustness, and age. If internal heat is indeed severe, adjuvant use of Huang Qin (Scutellariae Radix) and Zhi Mu (Anemarrhenae Rhizoma) is permissible.