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Answer: The four seasons possess abnormal Qi (vital energy), such as cold or warm conditions occurring during spring and summer, and warm or hot conditions occurring during autumn and winter. Therefore, throughout the year, regardless of age, patients often present with similar symptoms; this is referred to as the "seasonal epidemic Qi" (Shi Xing Zhi Qi), commonly known as "Tian Xing" (Heavenly Transmission). If the clear/cold pathogen overcomes the expected warmth of spring, the pathology is attributed to the Liver; if cold pathogen overcomes the expected heat of summer, the pathology is attributed to the Heart; if excessive heat overcomes the expected coolness of autumn, the pathology is attributed to the Lung; if excessive warmth overcomes the expected cold of winter, the pathology is attributed to the Kidney. Zhang Zhongjing stated: The toxin of Winter Warmth differs significantly from Cold Damage (Shang Han). Cold Damage arises from exposure to cold pathogens. Its manifestations include fever, aversion to cold, headache, pain in the waist and spine, a floating-tight pulse, and absence of sweating. For those without sweat, diaphoresis (sweating therapy) may be induced, and Mahuang Tang (Ephedra Decoction) is appropriate. For those with a floating-slow pulse and presence of sweat, muscle-releasing therapy may be applied, and Guizhi Tang (Cinnamon Twig Decoction) is appropriate. Carefully examined, both Mahuang (Ephedrae Herba) and Guizhi (Cinnamomi Ramulus) have the potential to cause abortion. Thus, it can be said that the treatment for Cold Damage during pregnancy differs greatly from that of ordinary individuals.

Shiquan San (Ten Complete Powder), also known as Baidu San (Defeat Poison Powder) or Renshen Qianghuo San (Ginseng and Notopterygium Powder), treats Cold Damage and plague.
Ingredients: Renshen (Ginseng Radix et Rhizoma), Baifuling (Poria), Qianghuo (Notopterygii Rhizoma et Radix), Duhuo (Angelicae Pubescentis Radix), Gancao (Glycyrrhizae Radix et Rhizoma, prepared), Chuanxiong (Ligustici Chuanxiong Rhizoma), Zhiqiao (Aurantii Fructus), Chaihu (Bupleuri Radix), Baizhu (Atractylodis Macrocephalae Rhizoma), Jiegeng (Platycodonis Radix) (all in equal parts).
Preparation and Administration: Cut the herbs into small pieces. Take 3 qian per dose, add 1.5 cups of water, 5 slices of ginger, and 7 leaves of bohe (Menthae Haplocalycis Herba), decoct until reduced to 0.7 cup, and take hot. If headache and fever persist, take two doses consecutively; recovery occurs upon sweating.

Ejiao San (Donkey-hide Gelatin Powder) treats Cold Damage in pregnant women to calm the fetus.
Ingredients: Ejiao (Colla Corii Asini), Sangjisheng (Taxilli Cacuminis), Wu Baizhu (Atractylodis Macrocephalae Rhizoma processed with bran/wine), Renshen (Ginseng Radix et Rhizoma) (all in equal parts).
Preparation and Administration: Grind into fine powder. Take 2 qian per dose, mix with glutinous rice decoction, and ingest at any time.

Zao Tai San (Fetal-Covering Powder)
Ingredients: Juan Heye (Nelumbinis Folium, rolled and dried, 1 liang), Bangfenhua (Concha Tridacnae Pulvis).
Preparation and Administration: Grind into fine powder. Take 2 qian per dose, add a little honey, mix with fresh drawn water, and take before meals.

Question 10 by Yan Shi: Why do pregnant women suffering from external contraction of wind-cold experience high fever, dizziness, and vertigo? Answer: This is due to wind-cold lodging in the skin and damaging Ying (Nutritive) and Wei (Defensive) Qi. It may result from washing the neck and back or cooling off in the wind, leading to dizziness and head pain, aversion to cold with fever, and even chest and heart irritability. Generally speaking, since there are two lives before birth (mother and fetus), one must not casually administer herbal decoctions. At the initial stage of a cold, only Xiongsu Yin (Ligusticum and Perilla Drink) should be taken to disperse exterior pathogens, after which the illness will resolve spontaneously.

Xiongsu Yin (Ligusticum and Perilla Drink)
Ingredients: Chuanxiong (Ligustici Chuanxiong Rhizoma), Zi Su Ye (Perillae Folium), Baishaoyao (Paeoniae Radix Alba), Baizhu (Atractylodis Macrocephalae Rhizoma), Maimendong (Ophiopogonis Tuber), Chenpi (Citri Reticulatae Pericarpium), Jiangjiang (Zingiberis Rhizoma, dried), Gancao (Glycyrrhizae Radix et Rhizoma, prepared, half liang) (the first seven ingredients each 1 liang).
Preparation and Administration: Cut the herbs into small pieces. Take 4 qian per dose, add 1.5 cups of water, 3 slices of ginger, and 1 cun of scallion white (Congbai), decoct until reduced to 0.8 cup, and take warm at any time.