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In the context of Spring-Warmth disease, if a woman experiences alternating chills and fever (alternating cold and heat), her menses happen to commence, or the illness occurs just as menstruation ceases, with clear consciousness during the day but confusion or delirium at night, this indicates Heat entering the Blood Chamber (the uterus and related blood vessels such as the Chong Mai). The appropriate treatment is Xiaochaihu Tang (Minor Bupleurum Decoction), removing Banxia (Pinelliae Rhizoma), and adding Dangguiwei (Angelicae Sinensis Radix caudex), Taoren (Persicae Semen), Shanzha (Crataegi Fructus), Danpi (Moutan Cortex), Chishao (Paeoniae Radix Rubra), Guang Yujin (Curcumae Longae Radix), and Xian Changpu (Acori Tatarinowii Rhizoma) to break up stasis and expel pathogens.

Zhang Zhongjing stated: When a woman contracts Cold Damage (Shanghan) and her menses happen to arrive, if Heat causes the flow to stop abruptly, resulting in alternating chills and fever, clear mind by day, and delirium by night, this is Heat entering the Blood Chamber. One should puncture the Qimen acupoint. This point is located under the hypochondrium and is the collateral connection of the Liver. The Blood Chamber refers to the Sea of Blood. According to the *Neijing* (Inner Canon), the Chong Mai (Penetrating Vessel) is the Sea of Blood. Furthermore, the Heart governs Blood, the Spleen controls Blood, and the Liver stores Blood. In women, menstrual blood is stored in the Chong Mai, and its proper accumulation and discharge depend on the coordinated function of the Liver, Spleen, and Heart. Now, if Heat transmits from the Shaoyang (Lesser Yang) into the Sea of Blood, it causes stasis and obstruction. Blood belongs to Yin, and night also belongs to Yin. The body's Wei Qi (Defensive Qi) travels through the Yang aspects during the day and the Yin aspects at night; therefore, pathogens that have entered the Blood manifest more severely at night. Tao氏 imitated Xiaochaihu Tang to ascend and vent Shaoyang pathogens, adding Dangguiwei, Taoren, Chishao, Danpi, and Shanzha to cool the blood and dispel stasis, while using Yujin and Changpu to open the orifices and vent pathogens. In severe cases, Dahuang (Rhei Radix et Rhizoma) and Ezhong (Eupolyphaga seu Steleophaga) are added to drive out the stasis. In summary, clinical discernment revolves around Qi, Blood, Ying (Nutritive) Qi, Wei Qi, Yin-Yang, and Exterior-Interior. The essence of medication lies in balancing Cold-Hot-Warm-Cool and employing Sweating, Vomiting, Purging, and Harmonizing methods appropriately.

If the Exterior syndrome of Spring-Warmth has not yet resolved, but sudden diarrhea occurs, accompanied by fullness and stagnation in the chest and epigastrium, which is painless upon pressure, with a yellow tongue coating and slippery pulse, this indicates pathogens sinking inward to form Pi Syndrome (obstructive fullness). The appropriate treatment is Xiexin Tang (Drain the Epigastrium Decoction), utilizing bitter descending and pungent unblocking methods.

Zhang Zhongjing discusses Pi Syndrome, attributing it mostly to pathogens sinking inward due to erroneous purgative therapy. Here, the Exterior syndrome remains unresolved, yet sudden diarrhea appears, similar in mechanism to erroneous purgation. Consequently, Exterior pathogens sink inward exploiting the deficiency, intending to exit downward. However, the patient's Stomach Qi remains strong, resisting the Heat, making direct expulsion difficult. Thus, the pathogen obstructs the area below the heart (epigastrium), accumulates without dispersing, forming a sensation of fullness, though painless on palpation. At this stage, sweating would fail to release the pathogen externally, while purging would fail to guide it downward. Therefore, Zhang Zhongjing employs Xiexin Tang: Huangqin (Scutellariae Radix) and Huanglian (Coptidis Rhizoma) use their bitter-cold nature to drain Heat; Banxia (Pinelliae Rhizoma) uses its pungent-warm nature to unblock Yang; Zhishi (Aurantii Fructus Immaturus) uses its bitter-dry nature to break up knots. For deficient patients, Renshen (Ginseng Radix) is added for its sweet-warm nature to support Zheng Qi (Upright Qi). It is named "Draining the Heart," but it does not actually drain the Heart organ; rather, it treats the fullness and stagnation in the epigastric region.