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Treating night sweats and fever caused by Yin deficiency with fire hyperactivity. What the Heart stores within is Blood, and what manifests externally is Sweat; Sweat is the fluid of the Heart. The Qi of the Five Zang and Six Fu organs, as well as the Yang Qi of the interior and exterior, are all governed by the Heart to facilitate their transformations. Fluids are generated where this Yang Qi resides, and sweat is secreted where Fire pathogenic factors disturb.

[Note: The original text contains fragmented phrases such as "sleeping involves Kidney Qi restoring," "facial redness," "Blood deficiency," "said: in the Liver; fluid from the Stomach" which lack complete syntactic structure in the provided excerpt. These fragments are omitted for coherence.]

Dang Gui (Angelicae Sinensis Radix), Sheng Di Huang (Rehmanniae Radix), Shu Di Huang (Rehmanniae Radix Preparata), Huang Qin (Scutellariae Radix), Huang Bo (Phellodendri Cortex), Huang Lian (Coptidis Rhizoma) [in equal parts], Huang Qi (Astragali Membranacei Radix) [doubled dosage].

These are herbs acting on the Hand-Shaoyin and Foot-Shaoyin meridians. Night sweats arise from Yin deficiency; Dang Gui, Sheng Di Huang, and Shu Di Huang are used to nourish Yin. Sweating arises from Fire disturbance; Huang Qin, Huang Bo, and Huang Lian are used to purge Fire (Moisture does not transform into sweat without Heat; when Moisture is steamed by Heat, it causes sweating). Sweating arises from insecure Cou Li (pores/skin texture); doubling the use of Huang Qi secures the Exterior (Li Shizhen stated: Adding Mahuang Gen (Ephedrae Radix et Rhizoma) to Danggui Liu Huang Tang treats night sweats very effectively. Its nature allows it to circulate through the entire body surface, guiding the other herbs to the Wei Qi level to consolidate the Cou Li. Note: This type of night sweat differs from that caused by Shang Han (Cold Damage): Shang Han night sweat occurs because the pathogen is at the Half-Exterior Half-Interior stage, so the primary treatment is harmonizing the Exterior; the ancient method uses Xiao Chai Hu Tang (Minor Chest Pivot Decoction) plus Guizhi (Cinnamon Twig). This condition belongs to Yin deficiency, so the primary treatment is tonifying Yin. Li Shicai said: In Yin deficiency, Yuan Qi (Original Qi) descends but does not ascend; using bitter-cold and austere agents like this might violate the prohibition against making deficiency worse (Xu Xu). It is only suitable for those with excess Fire and strong Qi; otherwise, bitter-cold herbs damage the Stomach Qi, deepening the disaster. *Zhun Sheng* states: When Yin is deficient, Yang must encroach, causing fever and night sweats; treat with Danggui Liu Huang Tang plus Digupi (Lycii Cortex). When Yang is deficient, Yin must overpower, causing cold limbs and spontaneous sweating; treat with Huang Qi Jian Zhong Tang (Astragalus Decoction to Establish and Enrich the Middle). For severe cases, add Fuzi (Aconiti Lateralis Radix Preparata), or use Fuzi Tang (Aconite Decoction). For damp-heat combined pathogens with incessant sweating, use wind-dispersing herbs to overcome dampness and bitter herbs to drain heat, such as Qianghuo Shengshi Tang (Notopterygium Decoction to Overcome Dampness). For phlegm syndromes with spontaneous cold sweat, regulate Qi and descend phlegm; once phlegm is resolved, sweating stops. If astringent herbs fail to stop sweating, regulate Heart Blood; since Sweat is the fluid of the Heart, if the Heart lacks nourishment and cannot control Blood, it overflows as sweat; treat with Da Bu Huang Qi Tang (Great Tonification Astragalus Decoction) plus Suanzaoren (Ziziphi Spinosae Semen). For slight heat, add Shibei (Dendrobii Caulis) and administer Lingsha Dan (Cinnabar Pill). Wang Haicang... [text missing] ... first... [text missing]."

Appendix: Puhan Fa (Powdering Method for Sweating): Baizhu (Atractylodis Macrocephalae Rhizoma), Ben Cao (Ligustici Rhizoma et Radix), Chuanxiong (Chuanxiong Rhizoma) [each 2.5 qian], Rice Flour (1 liang half). Grind into powder. Place in a silk bag and dust over the whole body to treat incessant sweating. Another prescription: Longgu (Fossilia Ossis Mastodi et Ossis Femoris), Muli (Concha Ostreae), Nuomi (Oryza Sativa Glutinosa), in equal parts. Grind into powder and dust.