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Zhang Zhongjing said: When a patient has a rapid pulse (Shu Mai, rapid pulse), which indicates heat, one would expect efficient digestion and increased appetite. However, if vomiting occurs instead, what is the reason? The physician answered: This results from sweating therapy, which has weakened Yang Qi (Vital Energy) and caused deficiency of Qi in the Diaphragm region. Consequently, the pulse appears rapid; this rapidness represents "Guest Heat" (temporary or external heat), which cannot digest food, due to cold deficiency in the Stomach. A wiry pulse (Xian Mai, wiry pulse) indicates deficiency, meaning there is no surplus of Stomach Qi. Food eaten in the morning is vomited in the evening, transforming into "Wei Fan" (Gastric Regurgitation). If cold pathogen resides in the Upper Jiao (Upper Burner), but the physician incorrectly uses purgative methods, the pulse may become wiry; thus, it is named deficiency. At the Fuyang pulse position (pulse felt at the dorsum of the foot), if it is floating (Fu Mai, floating pulse) and choppy (Se Mai, choppy pulse), floating indicates deficiency, and choppy indicates Spleen injury. Injury to the Spleen impairs its ability to grind and transform food. Food eaten in the morning is vomited in the evening, and food eaten in the evening is vomited in the morning, with undigested food remaining; this is called "Wei Fan". If the pulse is tight (Jin Mai, tight pulse) and choppy, the disease is difficult to treat.

The *Chao Shi Bing Yuan* (Source of Diseases by Chao Yuanfang) states: When Ying and Wei (Defensive and Nutritive Qi) are both deficient, and Qi and Blood are insufficient, retained water and accumulated fluids in the Epigastrium cause Cold in the Zang organs. Cold in the Zang organs leads to the Spleen's inability to grind and transform food. Inability of the Spleen to transform food results in undigested food. The rebellious upward movement of Qi forms Fan Wei (Reverse Stomach/Regurgitation). Thus, food eaten in the morning is vomited in the evening, and food eaten in the evening is vomited in the morning. There is hardness below the heart, large as a cup, accompanied by alternating chills and fever. In severe cases, vomiting occurs immediately after eating. The pulse is tight and wiry; tight indicates Cold, and wiry indicates Deficiency. Deficiency and Cold contend with each other, causing vomiting after eating, named Fan Wei.

Dai Yuanli stated: In Fan Wei syndrome, patients with Blood Deficiency will have a rapid but forceless pulse. Patients with Qi Deficiency will have a slow but forceless pulse. Patients with both Qi and Blood Deficiency will produce excessive saliva/phlegm in the mouth; if large amounts of saliva are seen spurting out, death is inevitable. Those with Heat will have a rapid and forceful pulse; those with Phlegm will have a slippery and rapid pulse. Both conditions are treatable. For Blood Deficiency, Si Wu Tang (Four Substances Decoction) is the primary formula. For Qi Deficiency, Si Jun Zi Tang (Four Gentlemen Decoction) is the primary formula. For Heat, detoxification is the primary method; for Phlegm, Er Chen Tang (Two Aged Decoction) is the primary method.

Prescription 1: Use two parts sugarcane juice and one part ginger juice, mix evenly. Take half a bowl or one bowl per dose, three times a day, until symptoms cease.

Prescription 2: Use Ren Shen (Ginseng Radix et Rhizoma); see the section on Vomiting.

Acupoints: Shangwan (CV13), Zhongwan (CV12), Xiawan (CV10) (each moxibustion 14 cones/moxa units); Tianshu (ST25) (moxybustion 21 cones/moxa units).

Li Zhong Tang (Warming Middle Decoction) [Heat property 1] Wen Wei Yin (Stomach Warming Drink) [New Heat property 5] Ju Pi Gan Jiang Tang (Tangerine Peel and Dried Ginger Decoction) [Heat property 55] Sheng Zhu Jian (Holy Artisan Decoction) [New Heat property 25] Huang Ya Wan (Yellow Sprout Pill) [New Heat property 21] Wu Jun Zi Jian (Five Gentlemen Decoction) [Heat property 6] Si Wei Hui Yang Yin (Four Ingredients Restoring Yang Drink) [Heat property 1] Liu Jun Zi Tang (Six Gentlemen Decoction) [Tonify property 5] Si Jun Zi Tang (Four Gentlemen Decoction) [Tonify property 1] Liu Wei Hui Yang Yin (Six Ingredients Restoring Yang Drink) [New Heat property 2] You Gui Yin (Right Restoration Drink) [New Tonify property 3] Wu Wei Yi Gong San (Five Flavors Extraordinary Power Powder) [Tonify property 4] Ren Shen Fu Zi Li Yin Jian (Ginseng and Aconite Nourishing Yin Decoction) [New Heat property 3] Ju Pi Tang (Tangerine Peel Decoction) [Heat property 56] Xiao Ban Xia Tang (Minor Pinellia Decoction) [Harmonize property 8] Jin Shui Liu Jun Jian (Metal-Water Six Gentlemen Decoction) [New Harmonize property 1] Er Chen Tang (Two Aged Decoction) [Harmonize property 1] Da Ban Xia Tang (Major Pinellia Decoction) [Harmonize property 10] Li Zhong Hua Tan Wan (Warming Middle Resolving Phlegm Pill) [Heat property 9] Wu Ling San (Five Ingredient Powder with Poria) [Harmonize property 182] Ping Wei San (Peaceful Stomach Powder) [Harmonize property 17] Ju Pi Ban Xia Tang (Tangerine Peel and Pinellia Decoction) [Harmonize property 13] Shi Gao (Pork Fat) [New Etiological property 29] Huang Qin Tang (Scutellaria Decoction) [Harmonize property 198] Ban Xia Xie Xin Tang (Pinellia Heart-Draining Decoction) [Cold property 28] Ge Hua Jie Cheng Tang (Kudzu Flower Relieving Intoxication Decoction) [Harmonize property 124] Ban Xia Gan Jiang San (Pinellia and Dried Ginger Powder) [Heat property 53] Wu Zhu Yu Tang (Evodia Decoction) [Heat property 137] Bu Huan Jin Zheng Qi San (Non-Exchanging Metal Upright Qi Powder) [Harmonize property 21]