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After childbirth, when contracting a cold (Shanghan), one must not lightly employ sweating methods. Fever during delivery may arise from excessive physical exertion, from excessive blood loss, from lochia stasis, from milk engorgement on the third day, or from early labor and food stagnation; these conditions resemble Shanghan, but require careful differentiation. One must never rashly induce sweating, as the consequences are irreversible like spilt water. Postpartum, the great blood is empty; heavy sweating leads to Yang collapse, while light sweating may cause muscle twitching, convulsions, dizziness with fainting, or convulsions, urinary difficulty, and constipation, leading to myriad complications. Generally, fever is often due to blood deficiency, where Yang has no foundation and floats outward, manifesting as heat. It is advisable to use Siwu Tang (Four Substances Decoction) as the principal formula, removing Chuanxiong Rhizoma (Chuanxiong) and Rehmanniae Radix Recens (Shengdi Huang), replacing them with Rehmanniae Radix Preparata (Shu Di Huang), and adding soft-stemmed Bupleuri Radix (Chaihu), Ginseng Radix et Rhizoma (Renshen), and prepared Zingiberis Rhizoma (Paojiang). This is most effective. Prepared Zingiberis Rhizoma is pungent and hot, with bitter and salty properties; it treats fire with fire, consolidates floating heat, guides blood-invigorating herbs into the blood level and qi-regulating herbs into the qi level, eliminates evil and generates newness, following the principle of "Yang generating Yin." Treating heat with heat deeply aligns with the teachings of the *Neijing* (Classic of Internal Medicine); when righteous Qi is strengthened, external pathogens disperse naturally.

Yang Gui stated: If there were originally Yin deficiency with fire hyperactivity before pregnancy, and postpartum excessive blood loss occurs, symptoms such as high fever, irritability, and sweating will inevitably appear. If one follows the previous method of heavily tonifying Qi and Blood, the condition will worsen. Instead, Xiaoyao San (Free and Easy Wanderer Powder) should be used to clear Liver fire and nourish Liver blood. Due to excessive blood loss, Liver deficiency and blood dryness result. One must not rigidly adhere to the theory of dual Qi and Blood deficiency. This argument is based on Yin deficiency fever and requires detailed analysis through pulse diagnosis.

Xue Lizhai stated: In newly delivered women, sudden loss of Yin blood leaves Yang without attachment, causing external heat. Siwu Tang (Four Substances Decoction) with added Paojiang (Prepared Zingiberis Rhizoma) is suitable to tonify Yin to harmonize Yang. If cold and draining formulas are mistakenly taken, resulting in external heat, this indicates Cold rejecting Yang to the exterior. Sijunzi Tang (Four Gentlemen Decoction) with Shengjiang (Fresh Zingiberis Rhizoma) and Rougui (Cinnamomi Cortex) is appropriate; if ineffective, Fuzi (Aconiti Lateralis Radix Preparata) should be urgently added. If skin feels hot, face is red, and there is extreme thirst with desire to drink, this is blood depletion causing dryness; Danggui Buxue Tang (Danggui Tonifies the Blood Decoction) is indicated. He also stated: Postpartum vexatious fever results from Yang scattering with Yin, leaving both Qi and Blood deficient, hence aversion to cold and fever. If mistakenly treated as a Fire syndrome and administered cooling agents, disaster will strike instantly.