Shenxiao San (Divine Efficacy Powder) treats asthma and cough in both the elderly and the young with divine efficacy.
Xingren (Apricot Seed, *Prunus armeniaca* L.), peeled and tipped, stir-fried, 1.5 liang; Gancao (Licorice Root, *Glycyrrhiza uralensis* Fisch.), honey-fried; Xuanfuhua (Inula Flower, *Inula japonica* Thunb.), each 3 liang; Baizhu (Atractylodes Rhizome, *Atractylodes macrocephala* Koidz.); Lianrou (Lotus Seed Flesh, *Nelumbo nucifera* Gaertn.), heart and skin removed; Shegan (Belamcanda Rhizome, *Belamcanda chinensis* (L.) DC.), soaked in rice wash water; Qianhu (Peucedani Radix, *Peucedanum praeruptorum* Dunn); Yumi (Papaveris Pericarpium, *Papaver somniferum* L.), lightly stir-fried; Baihe (Lily Bulb, *Lilium brownii* F.E.Brown var. *viridulum* Baker), soaked in water to remove foam; Bian Dou (White Hyacinth Bean Seed, *Lablab purpureus* (L.) Sweet), lightly stir-fried; Chuanxiong (Ligusticum Rhizome, *Ligusticum chuanxiong* Hort.), each 3 liang; Renshen (Ginseng Root, *Panax ginseng* C.A.Mey.); Fuling (Poria, *Poria cocos* (Schw.) Wolf.), each 4 liang; Shenqu (Massa Medicata Fermentata, *Medicated Leaven*), stir-fried, 5 liang; Sangbaipi (Morus Bark, *Mori Cortex*, *Mori radicis cortex*), honey-fried; Gegen (Kudzu Root, *Puerariae Lobatae Radix*), each 6 liang; Jiegeng (Platycodon Root, *Platycodon grandiflorum* (Jacq.) A.DC.), 7 liang.
Grind the above into a fine powder. Take 2 qian per dose, add 1 lamp of water, 3 slices of Shengjiang (Fresh Ginger, *Zingiberis Rhizoma Recens*), 1 Zao (Jujube Fruit, *Ziziphi Jujubae Fructus*), decoct until reduced to 0.7 parts, and take warm before meals.

The disease of Phlegm-Fluids (Tan Yin) in humans arises from the turbidity and coagulation of deteriorated Ying and Wei (Defensive and Nutritive Qi) and Qi and Blood. Internally, the Seven Emotions (Joy, Anger, Worry, Thought, Sorrow, Fear, Fright) cause chaos, leading to stagnation of Zang-Fu Qi; depression generates saliva, which condenses into fluids, constituting the Internal Cause (Nei Yin). Externally, the Six Evils (Wind, Cold, Summerheat, Dampness, Dryness, Fire) invade, blocking the Xu Fu (Sweat Pores); when sweating should occur but does not, accumulation forms fluids, constituting the External Cause (Wai Yin). Alternatively, excessive dietary injury, unrestrained desires, shouting to the point of extreme fatigue, or improper exercise hinder the flow of Jin Ye (Body Fluids), causing them to gather into Phlegm-Fluids, constituting the Neither-Internal-Nor-External Cause (Bu Nei Wai Yin). The manifestations resulting from these three causes are varied: some present as asthma, some as cough, some as vomiting or diarrhea, dizziness, epigastric discomfort and irritability, palpitations, alternating cold and heat, pain, swelling and fullness, spasms and masses, strangury and obstruction, resembling wind-stroke or mania; none of these do not result from Phlegm-Fluids.

Ancient formulas only distinguished four types of fluids and six syndromes, without discussing the Three Causes; without knowing the cause, the source of disease is unknown. Observing the methods for treating fluid retention: using Da Qing Long Tang (Major Blue Dragon Decoction), Xiao Qing Long Tang (Minor Blue Dragon Decoction), Gui Zhi Tang (Cinnamon Twig Decoction), Fang Ji Huang Qi Tang (Stephania and Astragalus Decoction), Wu Ling San (Five-Ingredient Powder with Poria), and Cheng Qi Tang (Order the Qi Decoction)—are these not for the External Cause? Can Shen Ling Bai Zhu San (Ginseng, Poria, and Atractylodes Macrocephala Powder), Ling Gui Zhu Gan Tang (Poria, Cinnamon Twig, Atractylodes, and Licorice Decoction), Ba Wei Wan (Eight-Ingredient Pill), and Shen Su Yin (Ginseng and Perilla Leaf Decoction) be not for the Internal Cause? Ten Date Formula (Shi Zao Tang), Ting Li Da Zao Xie Fei Tang (Descurainia Seed and Jujube Decoction to Drain the Lungs), Da Ban Xia Tang (Major Pinellia Decoction), Xiao Ban Xia Tang (Minor Pinellia Decoction), Kong Xian Dan (Control Saliva Pill), and Po Yin Fang (Break Fluids Formula)—are these not for the Neither-Internal-Nor-External Cause? Thus, the internal causes are clear. By deducing from this, one can grasp the logical categories. Now, listing various syndromes serves as the gateway to treatment; one must trace back to the root cause and apply decoctions accordingly, so that students may examine them carefully. The so-called Four Fluids are: Xuan Yin (Hanging Fluid), Yi Yin (Overflowing Fluid), Zhi Yin (Supporting Fluid), and Tan Yin (Phlegm-Fluid). Xuan Yin refers to water flowing under the hypochondrium, causing pain upon coughing and spitting. Yi Yin refers to water flowing into the four limbs; when sweat should emerge but does not, the body feels heavy and painful. Zhi Yin presents as coughing and wheezing requiring leaning to breathe, shortness of breath preventing lying flat, and a swollen appearance. Tan Yin occurs in individuals who were formerly robust but are now emaciated, with gurgling sounds in the intestines. There is also Liu Yin (Retained Fluid), characterized by coldness on the back the size of a hand, or shortness of breath with thirst, pain in the four limbs and joints, pain under the hypochondrium radiating to the Que Pen (ST12), worsening with coughing. There is also Fu Yin (Hidden Fluid), presenting as chest fullness, asthma, cough, vomiting; upon attack, there are alternating cold and heat, lower back and back pain, tearing, severe aversion to cold, and tremors. Therefore, it is said that the Four Fluids generate six syndromes; alternatively, if considered Five Fluids, Liu Yin and Fu Yin are combined into one syndrome. Their pulses are all wiry, faint, deep, and slippery. In treatment, Xuan Yin should be purged; Yi Yin should induce sweating; Zhi Yin requires syndrome differentiation for either sweating or purging; Tan Yin should be treated with warming medicines to eliminate via urination. Among these, if Qi rebels upward due to stagnation, hiding in the Yang meridians, it causes vomiting, dizziness, back coldness, or immobility of one arm, resembling wind-stroke patterns; this must not be ignored.