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There is a syndrome characterized by urgency and binding in the lower abdomen, or spitting of blood, or epistaxis; these are clear evidence that stagnant blood causes fever. Medication should not be limited to Chaihu (Bupleuri Radix) and Huangqin (Scutellariae Radix); instead, Chuanxiong (Ligustici Chuanxiong Rhizoma), Baizhi (Angelicae Dahuricae Radix), Taoren (Persicae Semen), Wulingzhi (Trogopterori Faeces), and Gancao (Glycyrrhizae Radix et Rhizoma) should be used as adjuvants. If constipation is present, Dahuang (Rhei Radix et Rhizoma) and thick honey are added to promote the passage of stagnant blood; once the black turbid matter is smoothly discharged, the fever will cease. Dongyuan stated: Fever is milder during the day and more severe at night, especially in the Taiyang Channel (Foot-Taiyang Bladder Channel). Daytime illness pertains to Qi, while nighttime illness pertains to Blood; this indicates floating heat within the Blood of the Foot-Taiyang Bladder Channel, accompanied by slight Qi involvement. Since the patient's urination and defecation are normal, it is known that the pathogenic factor is not in the Zang-Fu organs, meaning there is no interior syndrome. The absence of aversion to cold on the exterior indicates that the pathogenic factor is not in the exterior. The intermittent nature of the fever indicates that the pathogenic factor is neither in the exterior nor in the interior, but in the Collaterals. Frequent nighttime attacks and rare daytime attacks indicate deep sinking of the pathogenic factor. This miscellaneous disease should be treated according to "Heat Entering the Blood Chamber" (Re Ru Xue Shi), with the primary formula being Xiexue Tang (Blood-Draining Decoction). Danxi, when treating Yin-deficiency fever, differentiated Yin and Yang even within the foundational blood-nourishing formula Siwu Tang (Four Substances Decoction): the dynamic aspect of Blood is Yang, governed by Chuanxiong and Danggui (Angelicae Sinensis Radix); the static aspect of Blood is Yin, governed by Shengdihuang (Rehmanniae Radix) and Shaoyao (Paeoniae Radix). If Yin-blood is insufficient, although Chuanxiong and Danggui are acrid and warm, they should not be used. If Yang-blood is insufficient, although Jiang (Zingiberis Rhizoma) and Gui (Cinnamomi Ramulus) are acrid and hot, they may be used. Compared with fire-draining methods, there are direct treatments (Zhengzhi) and following treatments (Congzhi), all depending on clinical flexibility. For fever caused by alcohol consumption, it is because wine has a great heat and toxicity; when encountered by a person whose Yang Qi is naturally abundant, the heat becomes even more blazing, adding rigidity to rigidity, causing Yin Qi to scatter and Yang Qi to perish, making it difficult to treat. However, if depletion has not reached the point of perishing, it is still treatable. A wealthy young man in his twenties fell ill with fever in April. His pulse was weak and deficient upon both superficial and deep palpation. He experienced alternating fever and tidal fever without fixed timing, occasionally presenting a surging and rapid pulse that advanced and retreated with the fever. Thus, it was determined that this was not an external contraction fever, but rather residual toxin from alcohol retained internally, triggered now by Qi and Blood deficiency due to sexual exhaustion. Inquiry confirmed this. Consequently, Qi- and Blood-tonifying herbs were administered with Gegen (Puerariae Lobatae Radix) to resolve alcohol toxicity. After one dose, slight sweating occurred, followed by lethargy, and the fever persisted. It was reasoned that since both Qi and Blood were deficient, the patient could not tolerate the dispersing action of Gegen. Only Jiju Zi (Callicarpos Fructus) could resolve the toxicity. A small amount of dried Jiju Zi was accidentally obtained and added to the prescription, after which the fever immediately subsided. For fever caused by consuming meat and alcohol, Qingdai (Indigo Naturalis) and Gualou Ren (Trichosanthis Semen) with Ginger Juice are used. For fever caused by ingesting mineral-based acrid-hot medicines, Gancao and Wudou (Sojae Semen Praeparatum) decoction is taken. For fire-pathogen fever, Muguyin (Mugwort Decoction) is taken. For fever caused by consuming frozen drinks or foods, Ganjiang (Zingiberis Rhizoma) decoction is taken. For fever caused by roasted or fried foods, Chaqing (Tea Infusion) and Gancao decoction are taken. Fever recurring after Sanxiao (Three Consumptions/Thirst Disorders), various hemorrhages, postpartum consumptive disease (Rulao), chronic dysentery, or other deficiency syndromes is not a favorable condition. Some cases require direct attack on the cause of fever; others do not require specific treatment for the fever itself, as the fever arises from another disease. Treatment must follow the accompanying symptoms and cannot be generalized. For other fevers arising from various syndromes, the root disease should be treated primarily, adding antipyretic herbs to the base prescription. Yuanrong stated: Shen Su Yin (Ginseng and Perilla Decoction) is effective for all types of fever, regardless of etiology. It contains wind-dispelling herbs to release the exterior and Qi-regulating herbs to harmonize the middle, making it suitable for both external wind-cold contraction and internal accumulation of phlegm-fluids. When combined with Siwu Tang, it is named Fuling Buxin Tang (Poria Heart-Nourishing Decoction), which is particularly effective for deficiency fever. Thus, this formula treats both deficiency/excess and interior/exterior simultaneously, but should not be overused. For those with pre-existing phlegm-fluids, Liu Junzi Tang (Six Gentlemen Decoction) should be used for regulation after the fever subsides. For those with pre-existing Yin deficiency, Sancai Wan (Three Capabilities Pill) or similar formulas should be used for regulation after the fever subsides.

There are five methods of treating fever:
1. The method of "Harmonizing" (He): For mild fever, cool herbs should be used to harmonize. If harmonization fails, proceed to the method of "Taking" (Qu).
2. The method of "Taking" (Qu): For slightly intense fever, cold herbs should be used to purge/take. If purging fails, proceed to the method of "Following" (Cong).
3. The method of "Following" (Cong): For severe conditions, warm herbs should be used to follow the pathogen's trend, as the herbs are warm. Flavors adapt to the situation; sometimes cold herbs are used for heat (Han Yin Re Yong). Sometimes flavors are adapted to the treatment; or warm herbs are used for cold (Han Yi Wen Yong - *Note: Text implies adapting flavor to condition*). If diaphoresis fails, proceed to the method of "Breaking" (Zhe).
4. The method of "Breaking" (Zhe): For extreme severity, counter-control (Ni Zhi) should be used. If counter-control fails, use "Downward Purging" (Xia Duo). If downward purging fails, proceed to the method of "Belonging" (Shu).
5. The method of "Belonging" (Shu): This seeks the root essence to diminish the disease. Because heat has sunk deeply into the marrow, where no exit exists and acupuncture/herbs cannot reach, one seeks its belonging to weaken it. The method of seeking belonging is based on "like responds to like" and "same qi seeks same." The Classics state: "Sinking conditions are treated with moxibustion." The method of diminishing heat follows the principle that Fire declines at Xu hour and Metal declines at Chen hour. If this is insufficient, broaden the therapeutic approach. Like Sun Tzu using military strategy: in valleys, block springs; at water-land junctions, guard ferry crossings; in open plains, implement scorched earth tactics. Blocking springs refers to needling Shu points; guarding ferry crossings refers to intercepting the disease before onset; scorched earth tactics refer to administering major tonic drugs extensively to nourish Zheng Qi when muscles are emaciated.

Treating heat with cold, administered warmly, has three rationales: All involve using only Huangqi (Astragali Radix), Renshen (Ginseng Radix et Rhizoma), and Gancao. These three are sweet and warm. Although there is heat in both interior and exterior, with dryness generating internally and skin feeling hot externally, these sweet-warm herbs can harmonize, causing spontaneous sweating and resolution. This is the first profound truth of "warmth eliminating great heat." Second, extreme heat generates wind, moving left into the earth; tonifying the mother empties the son, allowing the Heavenly Dao to move right and proceed in order, ensuring recovery under the influence of Heaven's command. Third, since great heat is above, great cold must lie hidden within. Warm herbs dispel cold and assist Earth Qi. Earth Qi in humans is the generating Qi of the Stomach, strengthening True Qi.

[Diagnosis] A pulse that is floating, large, and powerless indicates deficiency. A pulse that is sunken, fine, and forceful indicates excess. A sunken, fine, or rapid pulse indicates death. Patients with fever who have "Fire" (vitality/pulse strength) survive; a Hong (Surging) Heart Pulse is an example. Those without "Fire" die; a sunken, fine pulse is an example. A floating and choppy pulse, or a choppy pulse with body heat, indicates death. Fever with a quiet pulse is difficult to treat. A full pulse with sweating that does not resolve the fever indicates death. A deficient pulse with unceasing fever indicates death. A weak pulse with cold limbs, aversion to people, inability to eat, and unceasing diarrhea indicates death.