大病瘥后，早犯女色而病者，为女劳复。女犯者
为男劳复。其症头重不能举，目中生花，腰背疼痛。四肢无力，憎寒发热，阴火上冲，头面烘热，心胸烦
闷。《活人书》以 鼠屎汤主之，有热者竹皮汤、烧 散主之。《千金》以赤衣散，虚弱者以人参三白
汤调赤衣散最妙。脉沉细，逆冷，小腹急痛者，以当归四逆散加附子、吴萸，调赤衣散救之。更以吴萸一
升酒拌炒熨小腹最妙。凡男卵缩入腹，女乳缩，脉离经者，死不可救。余治劳复，用麦冬汤每每取效。
瘥后余热未尽，肠胃虚弱，不能食而强食之，热有所藏，因其谷气留搏，两阳相合而病者，名曰食复。
男子病后，元气未复，而妇人与之交接得病者，名曰阳易；女人病后，元气未复，而男子与之交接得
病者，名曰阴易。其状男子则阴肿入腹，绞痛难忍；妇人则乳抽里急，腰胯痛引，腹内热攻胸膈，头重难
抬，仰卧不安，动摇不得，最危之症。
瘟毒发斑，毒之散者也；瘟毒发疮，毒之聚者也。初起之时，恶寒发热，红肿硬痛，此毒之发扬者；但
寒不热，平扁不起，此毒之内伏者。或发于要地，发于无名，发于头面，发于四肢，种种形状，总是疮症，
何以知其是疫？然诊其脉、验其症而即知也。疮症之脉洪大而数，疫则沉细而数；疮症先热后寒，疫则先
寒后热；疮症头或不痛，疫则头痛如劈，沉不能举；是其验也。稽其症，有目红、面赤而青惨者，
有忽汗忽燥者，有昏愦如迷者，有身热肢冷者，有腹痛不已者，有大吐干呕者，有大泄如注者，有谵语不止者，
有妄闻妄见者，有大渴思水者，有燥躁如狂者，有忽喊忽叫者，有若惊若惕者，神情多端，大都类是，误以疮症
治之，断不能救。
病后气血两虚，神志不能安守于内，所以出现心烦且无法入睡的症状。
大病痊愈后，过早进行房事而复发者，称为女劳复（男性因房事复发）。女性因房事导致复发者，称为男劳复（女性因房事复发）。其症状表现为头部沉重难以抬起，眼前出现花影，腰背疼痛。四肢无力，怕冷发热，阴火向上冲逆，头面部烘热，心胸烦闷。《活人书》主张用鼠屎汤主治，有热象者用竹皮汤、烧裈散主治。《千金方》主张用赤衣散，体质虚弱者用人参三白汤调服赤衣散最为巧妙。若脉象沉细，四肢逆冷，小腹部拘急疼痛者，用当归四逆散加附子、吴茱萸，调服赤衣散来救治。再用吴茱萸一升，用酒拌炒后熨烫小腹部，效果最好。凡是男子睾丸缩入腹中，女子乳房收缩，脉象离经乱序的，属于死证，不可救治。我治疗劳复症，常用麦冬汤，每每取得疗效。
病后余热未尽，肠胃虚弱，不能进食却强行进食，热气得以藏留，因为谷气停留搏结，新旧两阳相合而发病者，名叫食复。
男子病后，元气尚未恢复，与女子性交而致病者，名叫阳易；女子病后，元气尚未恢复，与男子性交而致病者，名叫阴易。其症状表现为：男子则阴囊肿胀并缩入腹中，绞痛难以忍受；女子则乳头抽缩，体内拘急，腰胯疼痛牵引，腹内热气攻冲胸膈，头部沉重难以抬起，仰卧不安，身体动摇不得，这是最危险的病症。
瘟毒发斑，是毒邪发散的表现；瘟毒发疮，是毒邪聚集的表现。初起之时，恶寒发热，红肿硬痛，这是毒邪向外发扬的表现；但寒不热，疮形平扁不起，这是毒邪向内潜伏的表现。有的发于要害部位，有的发于无名之处，有的发于头面，有的发于四肢，各种形状，总是疮症，如何知道它是疫病呢？然而通过诊察脉象、验证症状就能知晓。疮症的脉象洪大而数，疫病则脉象沉细而数；疮症先热后寒，疫病则先寒后热；疮症头部或许不痛，疫病则头痛如劈裂般剧烈，沉重得无法抬起；这就是鉴别依据。考察其症状，有眼睛发红、面色红中带青惨色的，有忽而出汗忽而干燥的，有昏迷糊涂如同迷乱的，有身热四肢冰冷的，有腹痛不止的，有大吐干呕的，有大泻如水注的，有胡言乱语不止的，有幻听幻见的，有大渴想喝水的，有烦躁狂乱如疯子的，有忽喊忽叫的，有惊恐不安的，神情表现多种多样，大抵类似这些情况，如果误当作普通疮症治疗，必定无法救治。
After the recovery from illness, if Heart Blood is deficient and the Heart loses its nourishment, it leads to an unsettled Mind Spirit (Shen).
If both Qi and Blood are deficient after recovery, the Spirit fails to reside within, resulting in vexation and insomnia.
If a patient engages in sexual intercourse too early after recovering from a major illness, it is called "female labor relapse" (relapse due to male sexual activity). If a woman suffers relapse due to sexual activity, it is called "male labor relapse." The symptoms include a heavy head that cannot be lifted, visual hallucinations (seeing flowers), pain in the lower back and waist, and weakness in the four limbs. There is aversion to cold with fever, rising of Yin Fire causing flushing of the head and face, and vexation and oppression in the chest and heart. *Huoren Shu* (Book of Vitality) recommends using Shushi Tang (Rat Dropping Decoction) as the primary treatment; for those with heat, Zhupi Tang (Bamboo Peel Decoction) or Shaosan (Burned Undergarment Powder) should be used. *Qianjin Fang* (Essential Prescriptions Worth a Thousand Gold) recommends Chiyi San (Red Garment Powder); for those who are weak, mixing it with Renshen Sanbai Tang (Ginseng Three Whites Decoction) is most excellent. For cases with a deep and fine pulse, cold extremities, and acute pain in the lower abdomen, Danggui Sini San (Angelica Decoctio Frigida Extremorum Powder) added with Fuzi (Prepared Aconite Root) and Wuyu (Evodia Fruit), mixed with Chiyi San, should be used to save the patient. Furthermore, frying one sheng of Wuyu with wine and applying it hot to the lower abdomen is most effective. In cases where the man's testicles retract into the abdomen, or the woman's breasts retract, accompanied by a pulse deviating from the normal course, death is inevitable and incurable. I treat labor relapse using Maidong Tang (Ophiopogon Decoction) and often achieve efficacy.
If residual heat remains after recovery, and the intestines and stomach are weak, forcing food intake when unable to eat causes heat to be retained. Because grain qi lingers and struggles, combining with existing heat (two Yangs merging) leads to disease, named "food relapse."
If a man, whose Yuan Qi has not yet recovered after illness, engages in intercourse with a woman and falls ill, it is called "Yang Yi" (Yang Exchange). If a woman, whose Yuan Qi has not yet recovered, engages in intercourse with a man and falls ill, it is called "Yin Yi" (Yin Exchange). The manifestations are: in men, swelling of the genitals retracting into the abdomen with unbearable colicky pain; in women, retraction of the nipples, internal tension, pain radiating from the waist and hips, heat attacking the chest and diaphragm from within the abdomen, heaviness of the head making it difficult to lift, inability to lie flat comfortably, and restlessness with inability to move. This is a critical condition.
Erythema caused by plague toxin represents the dispersion of toxin; sores caused by plague toxin represent the aggregation of toxin. At the initial stage, aversion to cold with fever, redness, swelling, hardness, and pain indicate the toxin emerging outward; aversion to cold without fever, flat and non-elevated lesions indicate the toxin lying latent inward. Whether occurring in vital areas, nameless places, on the head and face, or on the limbs, these various forms are all sores. How can one know they are plague? By examining the pulse and verifying the symptoms, it becomes clear. The pulse for sores is surging and rapid, whereas for plague it is deep, fine, and rapid. Sores present with heat first then cold; plague presents with cold first then heat. Sores may or may not have headache; plague features severe headache as if splitting, with heaviness preventing lifting. These are the diagnostic criteria. Examining the symptoms: there are cases of red eyes and ruddy complexion with cyan undertones, alternating sweating and dryness, stupor resembling confusion, fever with cold limbs, unceasing abdominal pain, severe vomiting and dry heaving, profuse diarrhea like a gush, incessant delirious speech, auditory and visual hallucinations, extreme thirst desiring water, irritability resembling madness, shouting and crying out intermittently, and states of惊惧 (fear and alarm). The mental and physical manifestations are diverse but largely similar. If mistakenly treated as ordinary sores, rescue is impossible.