战栗者，阴阳争战，故身为之摇也。邪气外与正气争，则为战。邪气内与正气
争，则为栗。战者正气胜，故有得汗而解者。栗则不战而但鼓颔，遂成寒逆。此阴气内热，正不胜
邪，宜姜附四逆汤加灼艾以御之。经曰∶阴中干邪，必内栗也。又云∶邪中下焦阴气为栗。足膝逆
冷，便溺妄出，皆此类耳。方在恶寒条，四逆汤、甘草干姜汤。若复躁而不得卧者，不治。
时行者，春应暖而反大寒，夏应热而反大凉，秋应凉而反大热，冬应寒而反大温，此非其时而
有其气。是以一岁之中，长幼之病多相似者，此实时行之气。春感寒邪在肝，升麻葛根解肌汤。夏
感寒邪在心，调中益气汤、射香汤、半夏桂枝甘草汤。秋感湿邪在肺，白虎加苍术；发黄，茵陈五
苓散。冬感寒邪在肾，名曰冬温，栝蒌汤。温疫通用人参败毒散、升麻葛根汤。从春分以后至秋分
节前，天有暴寒者，皆为时行寒疫，宜用辛温药发散。
伤寒两感，半属于阴，半属于阳，脏腑俱受病。一日太阳、少阴俱病，则头疼口干，烦满而渴。
二日阳明、太阴受病，则腹满身热，不欲食，谵语。三日少阳、
厥阴俱病，则耳聋，囊缩而厥，水浆不入口，不知人者，六七日死，长沙无治法。但凡两感病俱作，
治有先后，发表攻里，本自不同。后人以意消息，谓如下利不止，身体疼痛，当先救里，与四逆汤；
清便自调，与桂枝汤。然治有先后之说。
太阳先受病，在表，先解表。少阴先受病，在里，先救里。先表者，里不可缓也。先里者，表
亦不可缓也。此通权变之论也。
Tremors (Zhan Li) refer to the contention between Yin and Yang, causing the body to shake. When pathogenic factors contend with healthy Qi externally, it is called "Zhan" (shivering); when they contend internally, it is called "Li" (trembling). In "Zhan," healthy Qi prevails, so resolution through sweating may occur. In "Li," there is no shivering but only quivering of the jaw, leading to a state of cold reversal. This is due to internal excess of Yin Qi with heat, where healthy Qi fails to overcome the pathogen; it is appropriate to use Jiang Fu Si Ni Tang (Ginger and Aconite Decoction Reversing Cold) combined with moxibustion to resist the condition. The Classics state: "When Yin is invaded by pathogens, internal trembling must occur." It also says: "When pathogens strike the Lower Jiao, Yin Qi causes trembling." Cold reversal in the feet and knees, and incontinence of urine and feces all belong to this category. The formulas are found under the section on aversion to cold: Si Ni Tang (Reversing Cold Decoction) and Gan Cao Gan Jiang Tang (Licorice and Dried Ginger Decoction). If restlessness occurs such that the patient cannot lie down, it is incurable.
Shi Xing Bing (Seasonal Epidemic Disease) refers to spring being warm but unexpectedly cold, summer being hot but unexpectedly cool, autumn being cool but unexpectedly hot, and winter being cold but unexpectedly warm—this is having the Qi of one season at the wrong time. Therefore, within a year, diseases among people of all ages tend to be similar; this is the Qi of seasonal epidemics. In spring, contracting cold pathogens affects the Liver; treat with Sheng Ma Ge Gen Jie Ji Tang (Bupleurum and Pueraria Decoction to Release the Muscle Layer). In summer, contracting cold pathogens affects the Heart; treat with Tiao Zhong Yi Qi Tang (Regulating the Middle and Augmenting Qi Decoction), She Xiang Tang (Musk Decoction), or Ban Xia Gui Zhi Gan Cao Tang (Pinellia, Cinnamon Twig, and Licorice Decoction). In autumn, contracting damp pathogens affects the Lungs; treat with Bai Hu Jia Cang Zhu Tang (White Tiger plus Atractylodes Macrocephala Decoction). If jaundice appears, treat with Yin Chen Wu Ling San (Artemisia Scoparia Five-Ingredient Powder). In winter, contracting cold pathogens affects the Kidneys, named Dong Wen (Winter Warmth); treat with Gua Lou Tang (Trichosanthes Decoction). For Wen Yi (Warm Pestilence), Ren Shen Bai Du San (Ginseng Detoxifying Powder) or Sheng Ma Ge Gen Tang (Bupleurum and Pueraria Decoction) are generally used. From after the Spring Equinox to before the Autumn Equinox, if sudden cold weather occurs, it is all considered Shi Xing Han Yi (Seasonal Cold Epidemic), and acrid-warm herbs should be used to disperse the pathogen.
Shang Han Liang Gan (Cold Damage Double Contamination) involves half Yin and half Yang patterns, with both Zang and Fu organs affected. On the first day, Tai Yang and Shao Yin are both diseased, presenting with headache, dry mouth, irritability, fullness, and thirst. On the second day, Yang Ming and Tai Yin are affected, presenting with abdominal fullness, fever, anorexia, and delirious speech. On the third day, Shao Yang and Jue Yin are both diseased, presenting with deafness, retraction of the testicles, cold limbs, inability to take fluids, and unconsciousness; death typically occurs within six or seven days. Zhang Zhongjing (the Prefect of Changsha) left no treatment method for this. Whenever Liang Gan disease occurs simultaneously, treatment has a sequence; releasing the exterior and purging the interior are fundamentally different. Later practitioners adjusted based on circumstances, stating that if diarrhea persists and the body aches, one should first rescue the interior with Si Ni Tang; if bowel movements and urination are normal, give Gui Zhi Tang (Cinnamon Twig Decoction). This is the theory regarding the sequence of treatment.
If Tai Yang is affected first, the disease is in the exterior, so release the exterior first. If Shao Yin is affected first, the disease is in the interior, so rescue the interior first. If treating the exterior first, rescuing the interior must not be delayed. If rescuing the interior first, releasing the exterior must not be delayed. This is a discussion on flexible adaptation to changing conditions.