触冒寒气而为病，谓之伤寒。产妇血气俱虚，日月未满，而起早劳动，为寒所伤，则啬
啬恶寒，吸吸微热，数日乃歇。重者，头及骨节皆痛，七八日乃瘥也。
因产劳伤血气，使阴阳不和，互相乘克，阳胜则热，阴胜则寒，阴阳相加，故发寒热。
凡产余血在内，亦令寒热，其腹时刺痛者是也。
夫疟者，由夏伤于暑，客在皮肤，至秋因劳动血气，腠理虚而风邪乘之，动前暑热，正
邪相击，阴阳交争，阳盛则热，阴盛则寒。阴阳更虚更盛，故发寒热；阴阳相离，则寒热俱
歇。若邪动气至，交争复发，故疟休作有时。
其发时节渐晏者，此由邪客于风府，邪循膂而下，卫气一日一夜常大会于风府，其明日
日下一节，故其作日晏。其发早者，卫气之行风府，日下一节，二十一日下至尾 ，二十二
日入脊内，上注于伏冲之脉，其气上行九日，出于缺盆之内，其气既上，故其病发更早。
其间日发者，由邪气内薄五脏，横连募原，其道远，其气深，其行迟，不能日作，故间
产后血气损伤，而宿经伤暑热，今因产虚，复遇风邪相折，阴阳交争，邪正相干，故发作成疟也。
积者阴气，五脏所生；聚者阳气，六腑所成。皆由饮食失节，冷热不调，致五脏之气积
，六腑之气聚。积者，痛不离其部；聚者，其痛无有常处。所以然者，积为阴气，阴性沉伏
，故痛不离其部；聚为阳气，阳性浮动，故痛无常处。产妇血气伤损，腑脏虚弱，为风冷所
乘，搏于脏腑，与气血相结，故成积聚也。
因感受寒邪而引发的疾病，称为伤寒。产妇气血两虚，产后未满月，若过早起床劳作，被寒气所伤，就会出现怕冷（啬啬恶寒）、轻微发热（吸吸微热）的症状，数日后才会停止。病情严重的，头部及全身骨节都会疼痛，需要七八天才能痊愈。
因为分娩时的劳累损伤了气血，导致阴阳失调，互相克制，阳气偏胜则发热，阴气偏胜则发冷，阴阳相互交争，所以出现忽冷忽热的症状。凡是产后体内有残留瘀血，也会导致寒热往来，其中腹部时常出现刺痛的情况就是这类表现。
所谓疟疾（Malaria），是由于夏季感受暑邪，邪气潜伏在皮肤之间，到了秋季因为劳累导致气血波动，腠理（皮肤毛孔及其间隙）空虚，风邪趁机侵入，引动之前潜伏的暑热，正气与邪气相互搏击，阴阳发生交争，阳气盛则发热，阴气盛则发冷。阴阳之气交替虚弱和强盛，所以出现寒热交替；当阴阳暂时分离时，寒热症状就会停止。如果邪气再次触动正气，交争重新发作，所以疟疾的发作有固定的时间规律。
如果发作的时间逐渐推迟，这是因为邪气客居在风府穴，邪气沿着脊柱向下移动，卫气（运行于脉外、具有防御作用的气）一天一夜常在风府穴大会，第二天卫气下行一节，所以发作时间每天推迟。如果发作时间提前，是因为卫气在风府穴运行时，每天下行一节，二十一天后下行至尾骶部，第二十二日进入脊内，向上注入伏冲之脉（深层经脉），其气上行九天，出于缺盆穴内部，既然气已经上行，所以发病时间更早。
如果是隔日发作一次，是因为邪气向内迫近五脏，横向连接募原（脏腑之间的膜原），路径遥远，邪气深藏，运行缓慢，不能每日发作，所以隔日才发作。
产后气血受损，加上以前曾受暑热伤害，现在因为产后身体虚弱，又遇到风邪侵袭，正邪相搏，阴阳交争，所以发作形成疟疾。
“积”属于阴气，由五脏产生；“聚”属于阳气，由六腑形成。这都是由于饮食不节制，冷热不调，导致五脏之气积聚，六腑之气汇聚。所谓的“积”，疼痛位置固定不移；所谓的“聚”，疼痛位置没有定处。之所以这样，是因为“积”是阴气，阴性沉潜伏匿，所以疼痛不离其部位；“聚”是阳气，阳性浮动游走，所以疼痛没有固定位置。产妇气血损伤，脏腑虚弱，被风寒冷邪所乘，邪气搏结于脏腑，与气血相互凝结，从而形成了积聚病。
Diseases caused by exposure to cold pathogenic factors are termed Shanghan (Cold Damage). Postpartum women suffer from deficiency of both blood and qi. If they rise and engage in labor before the postpartum period has elapsed, they may be injured by cold, resulting in aversion to cold (se se e han) and slight fever (xi xi wei re), which cease after several days. In severe cases, pain occurs in the head and bone joints, taking seven or eight days to recover.
Labor during childbirth damages blood and qi, causing disharmony between Yin and Yang, leading to mutual overcoming. When Yang prevails, heat occurs; when Yin prevails, cold occurs. The interaction of Yin and Yang thus generates alternating chills and fever. Retained blood within the body after childbirth also causes chills and fever, characterized by occasional stabbing pain in the abdomen.
Malaria (Nue) arises from summerheat injury in summer, where the pathogen resides in the skin. In autumn, due to labor-induced fluctuation of blood and qi, the cou li (pores and interstices) become deficient, allowing wind pathogens to invade. This stirs up latent summerheat, causing a clash between righteous qi and pathogenic factors, and an exchange struggle between Yin and Yang. Excess Yang leads to heat, while excess Yin leads to cold. As Yin and Yang alternate between deficiency and excess, chills and fever manifest; when Yin and Yang separate, both symptoms cease. If the pathogen moves and qi arrives, reigniting the struggle, malaria exhibits periodic attacks.
When attacks occur progressively later, it is because the pathogen lodges at Fengfu (GV16). The pathogen descends along the Du Meridian (spine). Wei Qi (Defensive Qi) gathers at Fengfu once daily and nightly. On the following day, it descends one vertebral level, causing the attack time to delay daily. When attacks occur earlier, it is because Wei Qi descends one level daily from Fengfu. After twenty-one days, it reaches the coccyx; on the twenty-second day, it enters the spine internally, ascending into the Fu Chong Mai (Deep Penetrating Vessel). Its qi ascends for nine days, emerging inside the Quepen (ST12) region. Since the qi has ascended, the disease manifests earlier.
When attacks occur every other day, it is because the pathogenic factor presses inward toward the Zang organs and extends horizontally to the Mu Yuan (Sea of Origin/Membrane Source). The path is distant, the qi is deep, and its movement is slow, preventing daily occurrence, hence the interval.
Postpartum damage to blood and qi, combined with prior summerheat injury, creates a state of deficiency. Upon encountering wind pathogens, righteous qi and pathogens clash, Yin and Yang struggle, resulting in the formation of malaria.
"Ji" (Accumulation) belongs to Yin energy and originates from the Zang organs; "Ju" (Gathering) belongs to Yang energy and forms from the Fu organs. Both result from irregular diet and imbalance of cold and heat, leading to the accumulation of Qi in the Zang and gathering of Qi in the Fu. Ji presents with fixed pain location; Ju presents with migratory pain. This is because Ji is Yin energy, which is sinking and hidden, so pain remains localized. Ju is Yang energy, which is floating and moving, so pain lacks a fixed site. Postpartum damage to blood and qi weakens the Fu and Zang organs. Invasion by wind-cold causes the pathogen to knot with the organs and congeal with blood and qi, forming Ji-Ju disorders.