伤寒病新瘥，津液未复，血气尚虚，若劳动早，更复成病，故劳复也。若言语思虑则劳
神，梳头澡洗则劳力，劳则生热，热气乘虚还入经络，故复病也。其脉沉紧者，宜下之。
伤寒病新瘥，及大病之后，脾胃尚虚，谷气未复，若食猪肉、肠、血、肥鱼及油腻物
，必大下利，医所不能治也，必至于死。若食饼饵、KT 黍、饴 、HT 、枣、栗诸
果脯物，及牢强难消之物，胃气虚弱，不能消化，必更结热。适以药下之，则胃气虚冷，大
利难禁。不下之必死，下之亦危，皆难救也。大病之后，多坐此死，不可不慎护也。夫病之
新瘥后，但得食糜粥，宁少食乃饥，慎勿饱，不得他有所食，虽思之勿与，引日转久，可渐
食羊肉糜若羹，慎不可食猪狗等肉。
伤寒病后，多因劳动不节，饮食过度，更发于病，名之为复。复者，谓复病如初也。此
由经络尚虚，血气未实，更致于病耳。令预服药及为方法以防之，故云令不复也。
阴阳易病者，是男子妇人伤寒病新瘥未平复，而与之交接得病者，名为阴阳易也。其男
子病新瘥未平复，而妇人与之交接得病者，名阳易。其妇人得病新瘥未平复，而男子与之交
接得病者，名阴易。若二男二女，并不相易。所以呼为易者，阴阳相感，动其毒，度着于人
，如换易也。其得病之状，身体重，小腹里急，或引阴中拘挛，热上冲胸，头重不能举，眼
内生 ，四肢拘急，小腹 痛，手足拳，皆即死。其亦有不即死者，病苦小腹里急，热
上冲胸，头重不欲举，百节解离经脉缓弱，气血虚，骨髓空竭，便恍恍吸吸，气力转少，
着床不能摇动，起居仰人，或引岁月方死。
伤寒病刚刚痊愈，津液尚未恢复，气血依然虚弱。如果过早进行体力劳动或房事，导致疾病复发，这就称为“劳复”。如果因言语过多、思虑过重而耗损心神，或因梳头、洗澡等动作消耗体力，劳作就会产生内热；热气乘虚侵入经络，从而导致疾病复发。脉象表现为沉紧的，适宜采用攻下法治疗。
伤寒病刚痊愈，以及大病之后，脾胃功能仍然虚弱，谷气（饮食水谷化生的精气）尚未恢复。如果食用猪肉、猪肠、血制品、肥鱼以及油腻食物，必然会导致严重的腹泻，这是医生难以治疗的，最终会导致死亡。如果食用面食饼饵、黍米、饴糖、枣、栗子等各种果脯类食物，以及坚硬难消化的食物，由于胃气虚弱无法消化，必然会导致体内郁结热邪。此时若用药攻下，会使胃气变得虚寒，导致严重腹泻且难以控制。如果不攻下则必死无疑，攻下也处于危险境地，都很难救治。大病之后，许多人因此丧命，不可不谨慎调养。在病刚痊愈后，只能进食稀粥，宁可少吃感到饥饿，也要谨慎避免吃撑，不能吃其他食物，即使想吃也不要给。经过一段时间逐渐好转后，可以逐渐进食羊肉糜或羊肉汤，但千万不可食用猪、狗肉。
伤寒病后，多因劳动不节制、饮食过度而再次发病，这种病症称为“复”。“复”的意思是病情像初发时一样重新发作。这是因为经络仍然虚弱，气血尚未充实，再次导致生病。现在预先服药并采取措施来预防它，所以称为“令不复”。
所谓“阴阳易”病，是指男子或女子患伤寒病刚刚痊愈但身体尚未完全平复时，与异性发生性关系而染上的疾病，称为“阴阳易”。如果是男子病刚痊愈未平复，女子与他发生性关系而得病，称为“阳易”。如果是女子得病刚痊愈未平复，男子与她发生性关系而得病，称为“阴易”。如果是两个男子或两个女子之间，则不会互相传染。之所以称为“易”，是因为阴阳相互感应，触动毒邪，并将其转移给对方，就像更换衣物一样。其患病症状包括：身体沉重，小腹部拘急疼痛，有时牵引阴部痉挛，热气上冲胸部，头部沉重无法抬起，眼内生翳，四肢拘挛紧急，小腹痛，手足蜷缩，这些情况出现后通常立即死亡。也有不立即死亡的，痛苦在于小腹部拘急，热气上冲胸部，头部沉重不想抬起，全身关节松弛、经脉缓弱，气血虚弱，骨髓空虚枯竭，神情恍惚，气息微弱，体力逐渐减少，卧床不能动弹，起居需要他人帮助，或者拖延数月才死亡。
After a new recovery from Cold Damage disease (Shanghan Bing), the body fluids have not yet recovered, and Qi and Blood remain deficient. If physical exertion or sexual activity occurs too early, causing the disease to recur, it is termed "Labor Recurrence" (Lao Fu). Mental exertion such as excessive talking or thinking damages Shen (Spirit); physical exertion such as combing hair or bathing consumes strength. Exertion generates heat; this pathogenic heat, taking advantage of the deficiency, re-enters the meridians, causing the disease to recur. If the pulse is deep and tight, purgation is indicated.
Following a new recovery from Cold Damage disease, or after a major illness, the Spleen and Stomach remain weak, and Gu Qi (Grain Qi) has not yet recovered. Consuming pork, intestines, blood products, fatty fish, or greasy foods will inevitably cause severe diarrhea, which is difficult for physicians to treat and may lead to death. Consuming wheat cakes, broomcorn millet, malt sugar, dates, chestnuts, and other dried fruits, as well as hard-to-digest foods, will cause internal heat accumulation due to the weak Stomach Qi's inability to digest them. If purgatives are then administered, the Stomach Qi becomes cold and deficient, leading to uncontrollable severe diarrhea. Without purgation, death is certain; with purgation, the condition remains critical and difficult to save. Many die from this after major illnesses; careful nursing is essential. After a new recovery, only thin rice gruel should be eaten. It is better to eat little and feel hungry than to overeat. Do not consume other foods, even if desired. After some time, when gradually improving, mutton gruel or soup can be introduced, but pork and dog meat must strictly be avoided.
After Cold Damage disease, recurrence often results from unregulated exertion or excessive eating, causing the disease to return. This is named "Recurrence" (Fu). "Fu" means the disease returns as it was initially. This occurs because the meridians are still weak and Qi and Blood are not yet substantial, leading to renewed illness. Preemptive medication and preventive measures are employed to prevent this, hence termed "preventing recurrence."
The disease known as "Yin-Yang Exchange" (Yin Yang Yi) refers to an illness contracted by a man or woman who has newly recovered from Cold Damage disease but whose body has not yet fully stabilized, through sexual intercourse with the opposite sex. If a man recovers and a woman contracts the disease through intercourse, it is called "Yang Exchange" (Yang Yi). If a woman recovers and a man contracts the disease through intercourse, it is called "Yin Exchange" (Yin Yi). No exchange occurs between two men or two women. It is called "Exchange" because Yin and Yang interact, stirring up pathogenic toxins that transfer to the other person, akin to changing clothes. Symptoms include heavy body, urgency and pain in the lower abdomen, sometimes drawing into spasms in the genitalia, hot qi rushing to the chest, heavy head unable to be lifted, visual obscurations, limb stiffness and cramping, lower abdominal pain, and curled hands and feet. These symptoms typically lead to immediate death. In cases where death is not immediate, the patient suffers from lower abdominal urgency, hot qi rushing to the chest, heavy head unwilling to lift, loose joints, weak meridians, deficient Qi and Blood, empty marrow, mental confusion, weak breathing, declining strength, inability to move while bedridden, requiring assistance for daily activities, and death may occur after months.