王节斋曰∶妇人产后阴虚，阳无所根据，浮散于外，故发热。用四物汤补血，以炙干姜之苦温从治，收其浮
散，以归于阴也。
薛立斋曰∶新产妇人，阴血暴亡，阳无所附而外热，四物加炮姜，补阴以配阳。若误服寒凉克伐之剂而外
热，此为寒气格阳于外，四君子加姜、桂，不应，急加附子。若肌肤发热，面赤，大渴引饮，此血脱发燥也，
当归补血汤。
赵养葵曰∶产后大失血，阴血暴亡，必大发热，名阴虚发热。此阴字，正谓气血之阴。若以凉药正治必毙，
正所谓证象白虎，误服白虎必死。此时偏不用四物，有形之物，不能速化几希之气。急用独参汤，或当归补血
汤，使无形生出有形来。阳生阴长之妙，不可不知也。
薛立斋曰∶产后虚烦发热，乃阳随阴散，气血俱虚，故恶寒发热。若误作火证，投以凉剂，祸在反掌。
武叔卿曰∶丹溪治产后发热，以芎、归、四君子加黄 。不用芍、地者，以新产后用血脱益气之法，不宜
敛降凉血，以伐生气也。热甚者，加干姜。若产后阴血弱发热，四物加茯苓，热甚加炮姜。此方全不用气药，
是血虚气不虚也。加茯苓者，使大气降而阴自生，阴生则热自退。热甚加炒干姜者，不从阳引阴，亦可从阴引
阳，微乎微乎。
慎斋按∶以上七条，序产后有发热之证也。产后发热，有风寒，有伤食，有瘀血，有
蒸乳而外，大抵属阴血虚，而阳浮外。故当以辛温从治，戒用寒凉。若肝虚血燥，则宜补血。逍遥散清火，
亦宜慎用。阴血大脱，又当益气，毋用补血。此又用药之权衡也。
王节斋说：妇女产后阴血亏虚，阳气失去依附，浮散于体表，所以出现发热。治疗应用四物汤（由当归、川芎、白芍、熟地黄组成）来补血，配合使用炙干姜的辛温之性进行“从治”（顺从其假象而治），以收敛浮散的阳气，使其回归阴分。
薛立斋说：刚分娩后的产妇，阴血突然大量流失，阳气无所依附而浮越于外导致发热，可用四物汤加炮姜，通过补阴来制约阳气的浮越。如果误服寒凉攻伐的药物导致外热不退，这是寒气格拒阳气于外的表现，应使用四君子汤加生姜、肉桂；若无效，紧急情况下加入附子。如果表现为肌肤发热、面色发红、极度口渴且大量饮水，这是失血过多导致的血燥，应用当归补血汤。
赵养葵说：产后大出血，阴血突然枯竭，必然会出现高热，这称为阴虚发热。这里的“阴”，指的是气血中的阴液。如果用寒凉药物直接清热，必然导致死亡，这正是所谓的“证象白虎”（症状像阳明经实热的白虎汤证），若误服白虎汤必死无疑。此时甚至不宜用四物汤，因为有形质的药物不能迅速化生几近耗竭的无形之气。应紧急使用独参汤，或当归补血汤，使无形的元气生出有形的血液。其中蕴含的“阳生阴长”的奥妙，是不可不知道的。
薛立斋说：产后出现的虚烦发热，是由于阳气随着阴血的耗散而外越，气血都虚弱，所以既有恶寒又有发热。如果误认为是火证，投用寒凉药剂，灾祸就在顷刻之间。
武叔卿说：朱丹溪治疗产后发热，使用川芎、当归、四君子汤加上黄芪。不用白芍、地黄的原因在于，新产后应采用“血脱益气”的方法，不宜使用具有收敛、降逆、凉血作用的药物，以免损伤生机。如果热势严重，加入干姜。如果是产后阴血虚弱引起的发热，用四物汤加茯苓，热甚时加炮姜。这个方剂完全不用补气药，说明是血虚而气不虚。加入茯苓，是为了使大气下降从而阴液自生，阴液生成则热自退。热甚时加炒干姜，如果不从阳引阴，也可以从阴引阳，其中的机理微妙至极。
慎斋按语：以上七条，论述了产后发热的证候。产后发热，原因可能有风寒、伤食、瘀血、蒸乳等，但大体上属于阴血虚损，阳气浮越于外。因此应当采用辛温药物进行从治，严禁使用寒凉药物。如果是肝虚血燥，则适宜补血。逍遥散虽能清火，也应慎用。如果阴血大量脱失，又当益气，不要单纯使用补血药。这是用药时的权衡原则。
Wang Jiezhai stated: In postpartum women, Yin deficiency causes Yang to lose its foundation and float/scatter on the exterior, resulting in fever. Treatment should employ Siwu Tang (Four Substances Decoction) to nourish Blood, combined with the bitter-warm nature of Zhi Ganjiang (Honey-fried Dried Ginger) for "conforming treatment" (treating according to the apparent syndrome), to gather the floating Yang and return it to Yin.
Xue Lizhai stated: For a woman who has just given birth, sudden loss of Yin-Blood leaves Yang without attachment, causing external heat. Siwu Tang plus Paojiang (Charred Ginger) can be used to tonify Yin to anchor Yang. If external heat persists after mistakenly administering cold/clearing and draining agents, this indicates Cold rejecting Yang to the exterior; Sijunzi Tang (Four Gentlemen Decoction) plus Shengjiang (Fresh Ginger) and Rougui (Cinnamon Bark) should be used. If ineffective, Fuzi (Prepared Aconite Root) must be added urgently. If there is heat in the skin and muscles, redness of the face, and extreme thirst with excessive drinking, this is dryness due to blood loss; Danggui Buxue Tang (Dongquai Decoction for Tonifying Blood) is indicated.
Zhao Yangkui stated: After massive postpartum hemorrhage, sudden depletion of Yin-Blood inevitably leads to high fever, termed Yin-deficiency fever. The term "Yin" here refers specifically to the Yin aspect of Qi and Blood. Using cold medicines for direct treatment will certainly cause death. This is what is meant by "syndrome resembling Baihu [White Tiger]"; mistakenly administering Baihu Tang (White Tiger Decoction) will result in death. At this stage, even Siwu Tang should not be used, as substantial substances cannot quickly transform the nearly exhausted insubstantial Qi. Urgently use Dushen Tang (Single Ginseng Decoction) or Danggui Buxue Tang, allowing the insubstantial to generate the substantial. The subtlety of "Yang generation leading to Yin growth" must be understood.
Xue Lizhai stated: Postpartum empty vexation and fever occur because Yang scatters along with Yin, leaving both Qi and Blood deficient, thus presenting with aversion to cold and fever. If mistakenly treated as a Fire syndrome and administered cold formulas, disaster will strike instantly.
Wu Shuqing stated: Zhu Danxi treated postpartum fever using Xiong (Chuanxiong Rhizome), Gui (Danggui Radix), Sijunzi Tang (Four Gentlemen Decoction), plus Huangqi (Astragalus Root). Shaoyao (Peony Root) and Dihuang (Rehmannia Root) were omitted because the method of "tonifying Qi for Blood collapse" is appropriate for the immediate postpartum period; one should avoid astringent, descending, or cooling-blood herbs that might damage the vital Qi. If the heat is severe, Ganjiang (Dried Ginger) is added. If fever arises from weak postpartum Yin-Blood, Siwu Tang plus Fuling (Poria) is used; if heat is severe, Paojiang (Charred Ginger) is added. This formula uses no Qi-tonifying herbs, indicating Blood deficiency without Qi deficiency. Adding Fuling allows the Great Qi to descend, thereby generating Yin; once Yin is generated, the heat recedes. Adding fried Ganjiang for severe heat implies that if one does not guide Yin from Yang, one may guide Yang from Yin—the principle is extremely subtle.
Shenzhen commented: The above seven passages outline the syndrome of postpartum fever. Causes include Wind-Cold, food stagnation, blood stasis, and milk engorgement ("steaming breast"), but generally, it belongs to Yin-Blood deficiency with floating Yang on the exterior. Therefore, warm-acrid herbs for conforming treatment should be used, and cold/clearing herbs must be avoided. If Liver deficiency and Blood dryness are present, Blood tonification is suitable. Xiaoyao San (Free and Easy Wanderer Powder), which clears Heat, should also be used cautiously. If there is massive Yin-Blood collapse, Qi tonification is required rather than simple Blood tonification. This represents the weighing of therapeutic strategies.