百脉一宗皆病形。无复经络最难明。（巢氏云。伤寒百合病者。谓无经络。百脉一宗。悉致病也。皆因伤寒虚劳。大
病之后。不平复而变成斯病也。）欲卧又却不得卧。欲行还复不能行。饮食有美有不美。虽如强健步难胜。如有寒。复无
寒。如有热。复无热。口苦小便还赤结。药才入口即吐利。如有神灵来作孽。病后虚劳多变成。百合地黄汤可啜。（巢氏
云。其状意欲食获不得食。常默。欲卧复不得卧。欲出行而复不能行。饮食或有美时。或有不美时。或如强健人。而欲
卧复不得卧。如有寒复如无寒。如有热复如无热。至朝口苦。小便赤黄。百合之病。诸药不能疗。得药则剧而吐。如有
神灵所加也。身形如和。其人脉微软。每尿辄头痛。其病六十日乃愈。若尿时不头痛。淅淅然如寒者。四十日愈。若尿
时快然但眩者。二十日愈也。）
春气温和夏暑热。秋气凄凉冬凛冽。四时正气自调均。不犯寒邪无病孽。冬时寒凛欲周密。君子深藏宜入室。中而
即病曰伤寒。触冒寒邪成此疾。毒瓦斯若深不即病。至春与夏邪方出。春为温病夏为暑。变态无端证非一。（以上论伤寒也。
仲景云。春为温和。夏为暑热。秋气清凉。冬气冷冽。此则四时正气之序也。冬时严寒。万类深藏。君子周密。则不伤
于寒。触冒之者乃名伤寒耳。其伤于四时之气。皆能为病。以伤寒为最者。以其最成杀厉之气也。中而即病者。名曰伤
寒。不即病者寒毒藏于肌肤。至春变为温病。至夏变为暑病。暑病热极。重于温也。是以辛苦之人。春夏多温热病者。
皆由冬时触冒所致。非时行之气。）若乃时行自不同。盖是不时之气失。春时应暖反大寒。夏时应热却寒栗。秋气清凉大
热来。冬气寒时似春日。少长一般病相似。此是时行号温疫。欲知正气与天行。要在潜心占斗历。（以上论行时疫气。仲
景云。凡时行者。春时应暖而反大寒。夏时应热而反大凉。秋气应凉而大热。冬时应寒而反大温。此非时有其气。是一
岁之中。长幼之病相似者。此时行之气也。夫欲候知四时正气为病及时行疫气之法者。当按斗历占之。）
All the vessels originate from one source; when diseased, symptoms manifest throughout all vessels. The boundaries of the meridians become indistinct, making the condition extremely difficult to clarify. (Chao Yuanfang stated in *Zhu Bing Yuan Hou Lun*: In *Baihe* disease caused by *Shanghan*, there are no distinct meridian pathways; all vessels share one origin and are collectively affected. This usually transforms into this disease after *Shanghan*, *Xulao* (deficiency and emaciation), or following a major illness where recovery is incomplete.) The patient wishes to lie down but cannot sleep; wishes to walk but cannot move. Food tastes appealing at times and unpalatable at others; although appearing robust, the steps are heavy and difficult to sustain. There is a sensation of cold without actual cold signs; a sensation of heat without actual heat signs. The mouth is bitter, and urination is scanty, red, and painful. Medication causes vomiting or diarrhea immediately upon entering the mouth. The patient often feels as if possessed by spirits. This type of illness frequently transforms from *Xulao* (deficiency and emaciation) after a major illness. It can be treated with drinking *Baihe Dihuang Tang* (Lily Bulb and Rehmannia Decoction). (Chao Yuanfang recorded: The symptoms include wanting to eat but being unable to, often remaining silent, wishing to lie down but unable to sleep, wishing to go out and walk but unable to do so. Diet may seem good at times and bad at others. Or resembling a healthy person, yet unable to sleep when lying down. Feeling as if cold yet not cold, feeling as if hot yet not hot. By morning, the mouth is bitter, and urine is red and yellow. *Baihe* disease cannot be cured by various medicines; taking medicine aggravates the condition and induces vomiting, as if afflicted by spirits. The body shape appears normal, and the pulse is fine, weak, and soft. If headache occurs during each urination, it heals in sixty days; if there is no headache during urination but rather a shivering sensation like cold, it heals in forty days; if there is a smooth sensation during urination but only dizziness, it heals in twenty days.)
Spring climate is mild, summer heat is scorching, autumn air is desolate, winter wind is biting. The righteous qi of the four seasons naturally harmonizes; without encountering cold pathogenic factors, no disease or disaster arises. In winter, when the cold is biting, people should protect themselves meticulously, and gentlemen should stay indoors deeply. If illness strikes immediately after contracting cold, it is called *Shanghan* (Cold Damage); if contracted by exposure to cold pathogenic factors... (The text implies a contrast here regarding delayed onset). If the toxic qi is deep and does not cause immediate illness, the pathogen emerges in spring and summer. Manifesting in spring, it is called *Wenbing* (Warm Disease); manifesting in summer, it is called *Shubing* (Summerheat Disease). Its transformations are endless, and the syndromes are not uniform. (The above discusses *Shanghan*. Zhang Zhongjing said: Spring is mild, summer is hot, autumn is cool, winter is cold; this is the order of the righteous qi of the four seasons. In winter, severe cold causes all things to hide deeply; if gentlemen are meticulous, they will not be injured by cold. Those who are exposed are named having *Shanghan*. Injury by the qi of the four seasons can all cause disease, among which *Shanghan* is the most severe because it forms the most lethal qi. Contracting cold and falling ill immediately is named *Shanghan*; not falling ill immediately, the cold toxin hides in the skin and muscles, transforming into *Wenbing* in spring and *Shubing* in summer. *Shubing* has extreme heat, heavier than *Wenbing*. Therefore, hardworking people suffer more from warm-heat diseases in spring and summer, all caused by exposure in winter, not by the qi of the time epidemic.) If it is a time epidemic (*Shixing*), the situation is naturally different, due to the loss of proper seasonal qi. Spring should be warm but is instead very cold; summer should be hot but is instead cold and shivering; autumn should be cool but sudden heat arrives; winter should be cold but resembles spring. Young and old alike have similar illnesses; this is the time epidemic, called *Wenyi* (Warm Epidemic). To distinguish between righteous qi disease and heavenly passage epidemic (*Tianxing*), one must devote oneself to studying astronomical calendars. (The above discusses time epidemic qi. Zhang Zhongjing said: Whenever there is an epidemic, spring should be warm but is very cold; summer should be hot but is very cool; autumn should be cool but is very hot; winter should be cold but is very warm. This is not the appropriate qi for the season; within a year, the illnesses of the long and young are similar; this is the qi of the time epidemic. Regarding the method to observe and know diseases caused by the righteous qi of the four seasons and time epidemics, one should consult the Big Dipper calendar.)