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[Da Lun] Postpartum irregular menstruation is caused by the injury to Qi and Blood during childbirth, where the deficiency has not yet recovered. Wind pathogens and cold-heat Qi invade the meridians. Alternating cold and heat causes blood to coagulate in cold conditions and dissipate in heat conditions, resulting in varying amounts of menstrual flow, occurring either before or after the expected time, hence termed "irregular menstruation."

[Xue Ji's Commentary] If the aforementioned condition presents with pain upon delayed onset, it indicates a deficiency of both Qi and Blood; treat with Bazhen Tang (Eight-Treasure Decoction) added with Chaihu (Bupleuri Radix) and Danpi (Moutan Cortex). If it arrives early, it indicates Heat in the Blood; treat with Siwu Tang (Four Substance Decoction) added with Shanzhi (Gardeniae Fructus) and Chaihu (Bupleuri Radix). If pain occurs prior to the expected onset, it indicates Excess of Blood (Blood Stasis); treat with Siwu Tang (Four Substance Decoction) added with Taoren (Persicae Semen) and Honghua (Carthami Flos). If it arrives late, it indicates Blood Deficiency; treat with Siwu Tang (Four Substance Decoction) added with Renshen (Ginseng Radix) and Baizhu (Atractylodis Macrocephalae Rhizoma). If the blood is dark purple and forms clots, it indicates Heat in the Blood; treat with Siwu Tang (Four Substance Decoction) added with fried Shanzhi (Gardeniae Fructus), fried Lian (Coptidis Rhizoma), and Danpi (Moutan Cortex). If there is pain but the color is pale, it indicates excessive Phlegm-Dampness; treat with Siwu Tang (Four Substance Decoction) combined with Erchen Tang (Two-Aged Decoction). Treatment must be adapted to the specific clinical presentation. A case involved a postpartum woman with irregular menstruation, internal heat, dry mouth, and thirst. After taking cooling agents, her bleeding worsened into a flooding pattern, accompanied by abdominal distension, alternating chills and fever, vomiting, and poor appetite. She was treated with Liujunzi Tang (Six-Gentleman Decoction) for over twenty doses, after which all symptoms resolved. She was then regulated with Jia Wei Xiaoyao San (Modified Free and Easy Wanderer Powder) and recovered.

Hupo San (Amber Powder): Treats postpartum meridian irregularity, irritability and pain in the four limbs, complete loss of appetite, and progressive emaciation.
Ingredients: Hupo (Succinum), Niuxi (Achyranthis Bidentatae Radix), Sheng Gan Di Huang (Rehmanniae Radix Preparata), Danggui (Angelicae Sinensis Radix) (each 1 liang); Taoren (Persicae Semen), Chi Shaoyao (Paeoniae Radix Rubra) (each 0.5 liang).
Preparation and Administration: Grind into coarse powder. Take 3 qian per dose, add 1 zhan of water and 3 slices of fresh ginger, decoct until 6 fen remains, strain, and take warm.

Jianghuang Wan (Curcuma Pill): Treats postpartum weakness and insufficiency, shortness of breath in the chest and heart, tension in the abdomen, pain in the lower back and back, irregular menstruation, poor appetite, irritability and thirst, and weakness in the four limbs.
Ingredients: Jianghuang (Curcumae Longae Rhizoma), Danggui (Angelicae Sinensis Radix), Shu Dihuang (Rehmanniae Radix Preparata), Mudanpi (Moutan Cortex), Houpo (Magnoliae Officinalis Cortex) (processed), Guixin (Cinnamomi Ramulus), Chuanxiong (Ligustici Chuanxiong Rhizoma), Xuduan (Dipsaci Radix), Taoren (Persicae Semen), Baizhu (Atractylodis Macrocephalae Rhizoma) (each 1 liang); Chi Shaoyao (Paeoniae Radix Rubra), Muxiang (Aucklandiae Radix) (each 0.75 liang); Lingyangjiao Xie (Saiga Tataricae Cornu) (0.25 liang).
Preparation and Administration: Grind into fine powder, mix with refined honey to form pills the size of guzi (white mustard seeds). Take 30 pills per dose, administered with warm wine before meals.