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The main syndromes of Xiao Chai Hu Tang (Minor Bupleurum Decoction) are often referred to in medical texts as the "Four Major Main Syndromes" from *Shanghan Lun* (Treatise on Cold Damage): "alternating chills and fever" (Han Re Wang Lai), "fullness and distension in the chest and hypochondrium" (Xiong Xie Ku Man), "silent demeanor with loss of appetite" (Hei Hei Bu Yu Yin Shi), and "irritability with a tendency to vomit" (Xin Fan Xi Ou). The symptoms of "bitter taste in the mouth, dry throat, and vertigo" (Kou Ku, Yan Gan, Mu Xuan) are referred to as the "Outline Syndromes". However, the original text of *Shanghan Lun* also states: "If there is a Chai Hu syndrome, seeing just one symptom is sufficient; it is not necessary for all symptoms to be present." Regarding this statement—"seeing just one symptom is sufficient, no need for all to be present"—annotations by famous doctors throughout history have varied, with each offering their own insights. In my clinical practice, I have treated countless cases of colds with fever using Xiao Chai Hu Tang, many of which were typical presentations of the formula's indications. Among the four major syndromes, only "fever" that fluctuates at specific times is universally present in patients; the other three syndromes, or even all four together, are rarely seen. However, the syndrome of bitter taste in the mouth and dry throat is present in the vast majority of patients. Nevertheless, among cases cured by Xiao Chai Hu Tang, those with the typical pattern of "alternating chills and fever resembling malaria" are not common. Most cases exhibit "fever intensity rising and falling at regular intervals," showing periodic changes over time. This regular, periodic fluctuation of chills and fever can be considered a form of "alternating chills and fever."

In Case 2 of the "Selected Cured Cases of Xiao Chai Hu Tang" in this book, only two symptoms were observed: "alternating chills and fever" and "redness and swelling of the eyes." After administering Xiao Chai Hu Tang, the patient recovered immediately after finishing the first dose. Zhang Zhongjing's unique diagnostic method of "seeing just one symptom is sufficient, no need for all to be present" endows Xiao Chai Hu Tang with broad adaptability, thereby expanding its scope of clinical application.

IV. Not Only for Exterior Conditions, but Also Relied Upon for Interior Disorders

Xiao Chai Hu Tang is not only an essential formula for treating exterior febrile diseases but also possesses unique and remarkable efficacy when used for interior miscellaneous diseases. *Huang Han Yi Xue* (Imperial Han Medicine) once stated: "It can treat bronchitis, whooping cough, pulmonary tuberculosis, pleurisy, typhoid fever, malaria, gastroenteritis, liver diseases, pyelonephritis, gynecological diseases, etc." Although this summarizes more than ten types of diseases, the therapeutic scope of Xiao Chai Hu Tang for miscellaneous diseases is actually far broader. For instance, *Su Shen Liang Fang* adds: "For chronic phlegm obstruction, taking this formula after meals and before bed is particularly effective for dysentery... no other dysentery medicine compares..." Luo Qianfu also said: "This formula is a miraculous drug for spleen deficiency heat and seasonal malaria." Tang Rongchuan further highly praised Xiao Chai Hu Tang's efficacy in treating consumptive cough in *Xue Zheng Lun* (Treatise on Blood Diseases). Applying Tang's experience, I once treated a patient with pulmonary tuberculosis presenting with the four major symptoms of cough, hemoptysis, tidal fever, and night sweats, along with emaciation and fatigue. Using Xiao Chai Hu Tang added with Xing Ren (Almond), Bai Shao (White Peony Root), Tian Dong (Asparagus Root), and Bai Bu (Stemona Root), the hemoptysis, tidal fever, and night sweats ceased. The cough improved but did not fully resolve. Subsequent adjustments with Chuan Bei (Fritillaria Bulb), Tao Ren (Peach Seed), Dan Shen (Salvia Root), and Ping Di Mu (Ardisia Root) resolved all symptoms. I then prescribed Bai He Gu Jin Tang (Lily Bulb Decoction to Preserve the Metal) to nourish the root and conclude treatment (see "Pulmonary Tuberculosis Cured by Xiao Chai Hu Tang" in this book.). Thus, it is evident that Xiao Chai Hu Tang is indeed an excellent formula for treating tuberculous cough, confirming Tang's assertion. Modern medical research and application of Xiao Chai Hu Tang have become increasingly extensive, covering internal medicine, surgery, gynecology, pediatrics, otolaryngology, neurology, and other fields. Its applications are numerous, widely reported in various books and journals, so I will not list them all here.

V. Emerging Prominence in Cancer Treatment

According to *Modern Oncology*, "China sees approximately 1.6 million new cancer cases annually." Cancer is a malignant disease severely endangering people's lives and health. Currently, there is no definitive method to control or cure it. In research on traditional Chinese medicine (TCM) for cancer prevention and treatment, it has been found that Xiao Chai Hu Tang has a significant inhibitory effect on chemical carcinogens, receiving high attention from the medical community. Japanese physicians, in particular, have extensively explored its anti-cancer effects with promising results. For example, Osaka City University conducted clinical studies based on animal experiments, concluding that "for patients with liver cirrhosis, taking Xiao Chai Hu Tang can prevent the occurrence of potential microscopic hepatocellular carcinoma or delay its onset, making it a very meaningful preventive agent for liver cancer." "After radical surgery for malignant tumors, especially uterine cancer, radiotherapy is often administered, which frequently leads to refractory hemorrhagic cystitis with few effective treatments. A case report in Japan's *Kampo Medicine* (1984; 3) described a cure using Xiao Chai Hu Tang." "Japanese renowned physician Michimasa Yazu successfully treated reticulohistiocytosis with Xiao Chai Hu Tang. Malignant reticulohistiocytosis is a malignant disease caused by widespread abnormal proliferation of the endothelial system, known as 'a subtype of leukemia'." (Content quoted from *Effective Formulas for Anti-Cancer*.) From these reports, it is clear that in the army of TCM practitioners fighting cancer, Xiao Chai Hu Tang stands out. Not only does its direct anti-cancer action warrant study, but its mechanism of combating cancer also helps open new avenues for anticancer drug research. I once treated a patient with pancreatic cancer. Initially, a formula promoting Qi, resolving stagnation, invigorating blood, removing masses, and detoxifying was highly effective, with symptoms disappearing for over two years. Six months prior, the patient developed right upper quadrant bloating, pain, nausea, and vomiting, unresponsive to various medications. Considering the pattern of rebellious Gallbladder Qi and phlegm disturbance, I prescribed Xiao Chai Hu Tang added with herbs to promote bile flow and guide turbidity downward, resulting in complete recovery. Reusing the previous anti-cancer formula caused discomfort, whereas the modified Xiao Chai Hu Tang provided relief. The patient continued exclusively with this modified formula for several months, experiencing no symptoms, with good energy, sleep, and diet. The patient remains under observation.

In summary, Xiao Chai Hu Tang is not only a famous formula but also a miraculous one. It appears simple yet contains profound implications. In-depth research into it will undoubtedly contribute to the development of our national medicine and benefit humanity.

Selected Cured Cases of Xiao Chai Hu Tang

Case 1: Mrs. Ding retired in 1982 and worked from home with her husband making clothes. Their living space was cramped and depressing. Since summer, she had been sweating frequently. In late August, she caught a wind-cold cold, experiencing mild headache, nasal congestion, poor appetite, and fatigue. Self-medication with cold remedies failed to relieve symptoms. By September 9th, symptoms worsened. In the evening, she suddenly experienced severe chills. Despite the autumn dry heat and thick blankets, the chills persisted for about two hours, followed by fever. Her body felt like burning, and she subsequently experienced limb convulsions. Alarmed, her family rushed her to the hospital. Her temperature was 40.5°C, diagnosed as "fever of unknown origin." She received antipyretics, anticonvulsants, and fluid replacement. Convulsions stopped, and temperature dropped but did not normalize. Thereafter, she experienced alternating chills and fever every night. Antipyretics lowered the temperature slightly, but other symptoms remained. I was invited to consult on the evening of the 13th. Symptoms included aversion to cold and fever (cold preceding heat), spontaneous sweating upon movement, severe bitter taste in the mouth, distension and discomfort in both hypochondria (desire to rub), frequent nausea/vomiting. Fever had lasted four days; initially vomiting after eating, recently continuous nausea without vomiting. Poor appetite. Pulse was slippery and large at both Guan positions, deep/faint at Chi and Cun positions. Tongue coating was thin, slightly yellow, and dry. Temperature was 38.2°C. Based on these signs, this was undoubtedly Shaoyang syndrome of Cold Damage. I urgently prescribed Xiao Chai Hu Tang:

Chai Hu 3g, Dang Shen 9g, Jiang Ban Xia 9g, Huang Qin 9g, Zhi Gan Cao 3g, Sheng Jiang 1 slice, Hong Zao 3 pieces.

After three doses, all symptoms disappeared, chills and fever cleared, and appetite returned. Follow-up treatment involved two prescriptions regulating Qi and Yin.

Case 2: Mr. Zhou from Yancang Township, Nanhui, suffered from persistent fever starting in July 1992, hospitalized at the county hospital. Extensive examinations yielded no diagnosis; available medications failed to clear the fever. By January 1993, seven months had passed, costs exceeded 10,000 yuan, and the illness persisted. Introduced to me by a friend, I learned his fever ranged between 38–39°C, dropping below 38°C with Western medicine but rising again without it. Sometimes it subsided spontaneously for 3–4 days, only to return later. He reported no obvious symptoms, having only a minor cough due to a chronic condition. Examination revealed redness and congestion of the bulbar conjunctiva bilaterally, appearing simultaneously with the fever. Pulse was wiry on the left and small on the right; the right Guan position was fine and soft. Tongue was pale red with a thin white coating. I reasoned that the disease was not severe but lingering, with spontaneous remission and recurrence indicating insufficient righteous Qi and weak pathogenic factors, coexisting peacefully. The only obvious sign was red eyes. You Zaijing stated: "When Shaoyang is affected by pathogens and heat obstructs the meridians, it causes deafness, red eyes, chest fullness, and irritability." The initial onset was likely cold contraction in summer, with pathogens residing in Shaoyang, failing to disperse, leading to persistence. I prescribed Xiao Chai Hu Tang, adding lung-regulating herbs due to the slight cough:

Chai Hu 3g, Dang Shen 9g, Jiang Ban Xia 4.5g, Huang Qin 9g, Gan Cao 3g, Xing Ren 9g, Jie Geng 3g, Chuan Bei Mu 4.5g, Sheng Jiang 2 slices, Da Zao 5 pieces.

After only three doses, the fever cleared completely, and the cough stopped. He was discharged and has remained relapse-free for over five years.

Case 3: Migraine. Deputy Director Sun, female, approx. 40 years old, generally healthy except for intermittent migraines occurring several times a month, alternating sides. She regularly took ergotamine caffeine tablets, which provided slight relief but no cure. Examined by me via introduction: Pulse was small and wiry, softer on the right hand. Tongue substance was pale with a thin, slightly greasy white coating. Analysis based on the four diagnostic methods indicated that the lateral head is the pathway of the Shaoyang meridian; thus, lateral headaches point to Shaoyang pathology. The small, wiry pulse indicates Shaoyang Qi stagnation drawing pathogens inward. The softer right hand suggests weak middle Jiao Qi. The slightly greasy coating indicates damp-turbidity. Treatment aimed to support Middle Qi and soothe Shaoyang using Xiao Chai Hu Tang, added with Can Sha (Silkworm Sand), Jiang Can (Bombyx Batryticatus), and Chuan Xiong to transform phlegm, remove turbidity, and unblock collaterals for pain relief. Formula:

Chai Hu 3g, Tai Zi Shen 9g, Chao Bai Zhu & Bai Shao 9g each, Huang Qin 9g, Gan Cao 3g, Jiang Ban Xia 9g, Chuan Xiong 3g, Can Sha (wrapped) 15g, Jiang Can 9g.

The prescription proved effective, curing the condition. Two subsequent recurrences were also effectively treated with the same formula.

Case 4: Alopecia Areata. Son of the Meng family, young adult, sociable and business-oriented. Several years ago, he suddenly began losing patches of hair during sleep. Three patches were approx. 2cm in diameter, with six or seven smaller ones. Initially treated with Shen Ying Yang Zhen Dan and shampoo from *Yi Zong Jin Jian* for two weeks with no significant effect. Switched to Tong Qiao Huo Xue Tang from Wang Qingren's *Yi Lin Gai Cuo*. Condition remained unchanged. Finally, Xiao Chai Hu Tang was administered. After one week, short, sparse hairs began growing. After one month total, hair density returned to normal. Five to six years later, no recurrence.

Case 5: Impotence. General Manager of a group company, previously healthy. Developed an undisclosed issue after middle age, progressing from premature ejaculation to impotence. Years of TCM and Western medical treatment failed. Recommended to me by a friend. Pulse was choppy and constricted, wiry at the left Guan position. During consultation, signs of sorrow were evident. I deduced severe emotional trauma, confirmed by inquiry. Based on pulse and symptoms, the root cause was Liver Qi stagnation. Initial treatment should soothe the Liver and regulate Qi. Previous prescriptions were all kidney-nourishing and yang-strengthening. I adopted Chu Cheng's method: Bai Ji Li (Tribulus Fruit) 500g, stir-fried to remove spines, ground into fine powder. Taken twice daily, 6g each time with warm water. Upon finishing the powder, the patient joyfully reported "great effectiveness," stating he had never seen such good results since taking it. Follow-up pulse was fine and soft, with no other signs. Prescribed a formula to harmonize Liver and Kidney and tonify Yin and Yang equally. After two months, condition improved significantly, with normal sexual function restored. However, after stopping medication for half a year, symptoms recurred, with performance anxiety and marital complaints. Re-examination showed a change in pulse: wiry and forceful on the left, soft and large on the right. Signs indicated deficiency of Middle Qi and blazing Liver Fire. I directly prescribed the original Xiao Chai Hu Tang. After dozens of doses, sexual function was restored, and normalcy returned.

On "Tonifying the Middle" via Boosting Qi and Ascending Clear Yang

Li Dongyuan, one of the Four Great Masters of the Jin-Yuan dynasties, lived in a war-torn era where people suffered from famine, cold, and mental stress. Diseases abounded, and treating them with Cold Damage methods was often ineffective. Through long-term practice, Li observed that these factors easily depleted Yuan Qi and damaged the Spleen and Stomach. He advocated the theory "Internal injury to the Spleen and Stomach gives rise to hundreds of diseases," following the *Neijing* principle "Tonify weakness with warmth, benefit depletion." He emphasized regulating the Spleen and Stomach and ascending Middle Qi, creating the Bu Zhong Yi Qi Tang (Tonify the Middle and Augment Qi Decoction).

Bu Zhong Yi Qi Tang is adept at treating conditions where labor and fatigue injure the Spleen, grain Qi is insufficient, and Yang Qi sinks into the Yin causing fever. It is a formula for tonifying Middle Qi and raising Yang to lift sinking. It uses sweet-warm herbs to raise Yang Qi, achieving the ascending nature of spring. Huang Qi (Astragalus) tonifies Lung Qi; when Lung Qi is strong, it protects the skin and solidifies the interstices, stopping spontaneous sweating. Ren Shen (Ginseng) tonifies deficient Yuan Qi, addressing shortness of breath and reluctance to speak. Gan Cao (Licorice) clears excessive Heart Fire and internal烦热. Bai Zhu (Atractylodes) strengthens the Spleen, Dang Gui (Angelica Sinensis) harmonizes blood, and Chen Pi (Tangerine Peel) regulates Qi. Sheng Ma (Cimicifuga) and Chai Hu (Bupleurum), being light and clear, stimulate Stomach Qi to ascend and return to its proper position. The entire formula benefits Spleen and Lung Qi, disperses exterior cold, and raises sinking Yang. It applies to Spleen-Lung Qi deficiency presenting with fever, spontaneous sweating, shortness of breath, reluctance to speak, fatigue, limp limbs, sallow complexion, loose stools, surging but empty pulse, and pale tongue with white coating. It also treats prolapse of the rectum, uterus, chronic diarrhea, chronic dysentery, chronic malaria, and other conditions of sinking Clear Yang. Thus, this formula is warm and drying, tonifying and ascending. It is unsuitable for patients with Yin deficiency, Yang deficiency, combined Yin-Yang deficiency, upper excess/lower deficiency, or Liver-Kidney essence and blood depletion.

Wei Yuheng of the Qing Dynasty disagreed in *Xu Ming Yi Lei An*: "Bu Zhong Yi Qi Tang is Li Dongyuan's primary formula for internal injury and exterior conditions. Later readers rarely fail to regard it as an absolute rule. However, they do not know that modern patients mostly suffer from true Yin deficiency, with nine out of ten having upper excess and lower deficiency. Even when encountering internal injury or exterior conditions, administering this formula often exacerbates the disease."

There is actually no contradiction between the two. Li Dongyuan created Bu Zhong Yi Qi Tang to treat sinking Qi deficiency, not true Yin deficiency. Living in frequent wars in the north with dry climates, Li easily damaged the Spleen/Stomach, causing Yang to sink into Yin. His creation met the therapeutic needs of his time and was impeccable. Wei Yuheng, born in the peaceful Qing Dynasty in the humid southeast near fish and salt lands, where abundance led to indulgence, saw easy depletion of true Yin. Such patients certainly cannot take Bu Zhong Yi Qi Tang, nor anything slightly warm and drying. Hence Wei said: "It is not that the formula is wrong, but that era and constitution differ." This is the rational words of a wise man.

Since ancient times, the number of established formulas is countless. Each formula has its specific indications and adapted syndromes. The formula itself is not at fault; it depends entirely on the physician's skillful use. While Wei's words hold truth, in current clinical practice in Shanghai, where many suffer from Yin deficiency and upper excess/lower deficiency, there are still many suitable for Bu Zhong Yi Qi Tang. However, through my use of this formula, I observe the following characteristics: First, modern patients rarely present with pure Middle Qi sinking; it is often accompanied by other diseases, with sinking Qi as the main symptom or cause. Therefore, one should not use Bu Zhong Yi Qi Tang purely but adjust according to differentiation. Second, patients easily show systemic Qi deficiency or Middle Qi insufficiency, often lacking obvious sinking signs. Careful recognition is essential to avoid error. Third, Qi deficiency pulses can be large and forceless or fine and soft. Mild sinking may not show special pulse features, while severe sinking shows weak Cun and strong Chi pulses.

Here are five cases briefly illustrating some efficacies of Bu Zhong Yi Qi Tang.

(I) Boosting Qi and Ascending Clear Yang Can Cure Headache

Ms. Yang, an apprentice in a shop, suffered from frontal headaches for years, intermittent, unresponsive to Chuan Xiong Cha Tiao San and Western medicines. One day, pain intensified, and she sought my treatment. Pulse was fine, coating thin. She reported a slight cold. I diagnosed weak Middle Qi but prioritized treating the acute symptom. Prescriptions for releasing the exterior, dispelling wind, relieving pain, and transforming phlegm failed, and the cold did not improve. I realized her fatigue indicated declining Middle Qi; the irregular frontal headache resulted from Qi deficiency failing to ascend Clear Yang; and cold medicines require Yuan Qi to exert their effect. Thus, the key was to boost Middle Qi and ascend Clear Yang to strengthen the Spleen/Stomach and solidify the interstices. I prescribed Bu Zhong Yi Qi Tang added with Bai Zhi (Angelica Dahurica). After two doses, the cold resolved, and headache greatly reduced. After three more doses, the headache vanished completely and never returned.

Note: *Yi Zong Bi Du* states: "The head is the image of heaven; Qi of all Yang meridians of the six Fu organs and essence blood of the five Zang organs converge here. Thus, external six evils and internal five Zang changes can harm it." Headaches arise from exterior conditions, internal injuries, deficiency, or excess. Among deficiency patterns, sinking Qi and failure to ascend Clear Yang cause irregular headaches, often dull and continuous, accompanied by fatigue and susceptibility to colds. The above case belongs to this category. Thus, Bu Zhong Yi Qi Tang was used to tonify Qi and ascend Clear Yang, assisted by Bai Zhi to dispel wind-cold and treat headaches. Ancient Shen Bai San used Bai Zhi, Gan Cao, Ginger, Scallion, and Dou Chi for wind-cold. Yang Jilao made a pill of single-ingredient Bai Zhi for headaches, named Du Liang Wan, becoming a classic. Adding it to Bu Zhong Yi Qi Tang addresses both root and branch, ensuring cure.

(II) Ascending Spleen and Transforming Fluids Can Treat Phlegm Cough