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Answer: Disharmony of Yin and Yang, and the failure of lochia (residual blood after childbirth) to disperse, both cause alternating chills and fever. After childbirth, Qi and Blood are deficient and damaged, leading to disharmony of Yin and Yang. When Yin prevails, there is alternating chills; when Yang prevails, there is alternating fever. As Yin and Yang mutually prevail, one experiences either chills or fever. If this is caused by labor during childbirth damaging the Zang-Fu organs, causing Blood deficiency and preventing its proper circulation and diffusion, thus resulting in the stagnation of lochia. If lochia enters the Lung, it causes heat; if it enters the Spleen, it causes cold. It is erroneous for physicians to mistakenly treat this as malaria (Malaria). For symptoms due to disharmony of Yin and Yang, Zengsun Siwu Tang (Modified Four Substances Decoction) is appropriate; for symptoms due to the failure of lochia to disperse, Duoming Dan (Life-Restoring Pill) is appropriate. Further question: How can these two be distinguished? Answer: If accompanied by paroxysmal stabbing pain, it is due to lochia stagnation; if there is only alternating chills and fever without other symptoms, it is due to disharmony of Yin and Yang.

Zengsun Siwu Tang (Modified Four Substances Decoction)
Danggui (Radix Angelicae Sinensis), Shaoyao (Radix Paeoniae Alba), Renshen (Radix Ginseng), Chuanxiong (Rhizoma Chuanxiong), Ganjiang (Rhizoma Zingiberis Recens), each 1 liang; Gancao (Radix Glycyrrhizae Preparata, honey-fried), 4 fen.
Crush the above herbs into coarse powder. Take 2 qian per dose, with 1 sheng of water, 5 slices of Shengjiang (Rhizoma Zingiberis Recens), decoct until 0.6 sheng remains, strain, and take hot.

Zengsun Chaihu Tang (Modified Bupleurum Decoction). Treats postpartum emaciation, aversion to cold, poor appetite, and abdominal distension in women.
Chaihu (Radix Bupleuri), 3 qian; Renshen (Radix Ginseng), Gancao (Radix Glycyrrhizae), Banxia (Rhizoma Pinelliae Preparata), Baishao (Radix Paeoniae Alba), Chenpi (Pericarpium Citri Reticulatae), Chuanxiong (Rhizoma Chuanxiong).
Crush the above herbs into coarse powder. Take 4 qian per dose, with 1.5 sheng of water, 3 slices of Shengjiang (Rhizoma Zingiberis Recens), 1 date, decoct until 0.7 sheng remains, take warm, after meals, three times a day.

Zhushen Tang (Pig Kidney Decoction). Treats early postpartum period where prolonged sitting, excessive use of eyes/ears/speech, or physical exertion leads to pain in the head, neck, limbs, joints, skin, and flesh, accompanied by alternating chills and fever. This is Churu Lao (Postpartum Consumptive Disease).
Zhushen (Kidney of Sus scrofa domesticus, a pair, remove fatty membrane), Danggui (Radix Angelicae Sinensis), Shaoyao (Radix Paeoniae Alba), Shengjiang (Rhizoma Zingiberis Recens), each 3 liang; Guixin (Cortex Cinnamomi), Congbai (Bulbus Allii Cepae), 2 he.
Add 8 sheng of water, slowly boil the pig kidney to extract 6 sheng of juice, clarify, then add the other herbs, decoct until 2 sheng remains, divide into three doses, take warm.

Jiajian Bazhen Tang (Modified Eight Treasures Decoction)
Danggui (Radix Angelicae Sinensis), 1.5 qian; Chuanxiong (Rhizoma Chuanxiong), 1 qian; Shudi (Radix Rehmanniae Preparata, stir-fried with ginger juice), 5 qian; Baizhu (Rhizoma Atractylodis Macrocephalae), 1 qian; BaiFuling (Poria), 1 qian; Renshen (Radix Ginseng), 3 fen; Yimucao (Herba Leonuri), 1 qian; Chenpi (Pericarpium Citri Reticulatae), 5 fen; Sharen (Fructus Amomi Rotundus), 5 fen.
Crush the above herbs into coarse powder. Use 1.5 zhong of water, decoct until 0.7 zhong remains, take warm before meals. After taking two doses, alternate with Yimu Wan (Motherwort Pill). Take Yimu Wan with Xionggui Tang (Chuanxiong and Danggui Decoction).