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*Huo Ren Shu* (Book of Saving Lives) states: In Yin Poison syndrome, the pulse is rapid, reaching seven to eight beats per respiration or more, so fast that it cannot be counted; this indicates that Yin Poison has deeply penetrated. The six pulses are deep, fine, and rapid; the Chi position is faint and small, while the Cun Kou position may be large. If cold-natured medicines are mistakenly administered, thirst will intensify, and restlessness will become more urgent. For those presenting with these two signs, acrid-warm medicines should be taken urgently; recovery can occur within one or two days. If Yin Poison gradually deepens, symptoms include heaviness of the body, coldness of the four limbs and head, worsening abdominal pain, pharyngeal obstruction, fullness and hardness in the epigastrium accompanied by dryness and thirst, continuous deficiency sweating, and the six pulses remaining deep, fine, and rapid at seven beats or more per respiration. For such cases, moxibustion should be performed urgently on the Qihai (CV6, Sea of Qi) and Guanyuan (CV4, Gate of Origin) acupoints, three hundred moxa cones each, until the hands and feet become warm, indicating efficacy. Simultaneously, Zheng Yang San (Positive Yang Powder) should be administered. Shouzhen (Liu Wansu) stated: Since the pulse is rapid, reaching seven to eight beats or more per respiration and becoming uncountable, this is actually a pulse sign of extreme excess Yang-heat. Worldly customs erroneously transmit various syndromes of Yin Poison; verifying them against the *Su Wen* (Plain Questions), they are all syndromes of extreme hyperactive Yang-heat. The heat lies internally, the disease location is extremely deep, and the exterior superficially resembles Yin-cold. Furthermore, as the classics state, "When things reach an extreme, they cause harm; only then is there control," meaning the principle of the Five Elements: when excess reaches an extreme, it reverses to resemble the element that controls it; this is called concurrent transformation. Just as things heated to the extreme produce fluids, or when fire refines metal, extreme heat transforms into water, thus fire at its extreme transforms via water. The *Su Wen · Mai Yao Jing Wei Lun* (Treatise on the Essentials of Pulse Diagnosis) states: A long pulse indicates regulated Qi; a short pulse indicates diseased Qi; a rapid pulse indicates mental restlessness; a large pulse indicates disease progression. (The commentary notes: Rapid and urgent pulses indicate heat, hence mental restlessness.) Additionally, the *Su Wen · Liu Jie Zang Xiang Lun* (Treatise on the Six Nodes and Visceral Manifestations) states: When the Ren Ying pulse is one times larger than the Cun Kou pulse, the disease is in Shaoyang; two times larger, in Taiyang; three times larger, in Yangming; four times larger or above constitutes Ge Yang (Rebellious Yang). (The commentary notes: This means the Ren Ying pulse is greater than the Cun Kou pulse by one fold. The method for the others is similar. It also states: Both being excessive means greater than the normal pulse by four folds.) Four times larger or above constitutes Guan Ge (Obstruction and Reversal); the Guan Ge pulse is emaciated; unable to exhaust the essence and Qi of Heaven and Earth, death ensues.

*Huo Ren Shu* states: Taiyin, Shaoyin, and Jueyin all belong to Yin syndromes. Shaoyin corresponds to the Kidney; Jueyin corresponds to the Liver; Taiyin corresponds to the Spleen. What is Taiyin? Taiyin is the meridian of the Spleen, primarily governing chest and diaphragmatic distension. What is Shaoyin? Shaoyin is the meridian of the Kidney, primarily governing a minute and fine pulse, and symptoms of mental restlessness and desire to sleep. If there is spontaneous diarrhea with thirst, why is this? It is because upon contracting the pathogen, the cou li (pores and interstices) become cold, allowing the pathogen to enter the Yin meridians directly without passing through the Three Yang meridians. Cold entering the Taiyang meridian causes fever and aversion to cold; entering the Shaoyin meridian causes only aversion to cold without fever. For cold in the Three Yin meridians: if mild, Li Zhong Tang (Regulate the Middle Decoction) is used; if slightly cold extremities or cold-induced diarrhea occur, Gan Cao Gan Jiang Tang (Licorice and Dried Ginger Decoction) is used; if severe, Si Ni Tang (Four Counterflow Decoction) is used; if there is no pulse, Tong Mai Si Ni Tang (Pulse-Recovering Four Counterflow Decoction) is used. What is Jueyin? Jueyin is the meridian of the Liver. The primary manifestations of the Jueyin meridian include thirst with excessive drinking, Qi rushing upward to the heart, pain and heat sensation in the heart, hunger without desire to eat, vomiting of roundworms after eating, and persistent diarrhea if purgatives are used. If Yin Qi alone becomes excessive and Yang Qi suddenly fails, it becomes Yin Poison. Its symptoms include cold extremities, beating pain in the abdomen and umbilicus, body pain as if beaten by a stick, deep and rapid pulse, vomiting or diarrhea. Emergency moxibustion below the umbilicus should be performed, along with administration of acrid-warm medicines, to restore Yang Qi and induce profuse sweating. Shouzhen said: When humans contract Shang Han (Cold Damage), it becomes a heat disease; this is consistent from ancient times to the present, collectively termed Shang Han Bing. In the first three days, the Ju Yang (Greater Yang), Yangming, and Shaoyang meridians receive the pathogen; the heat is in the exterior, and sweating cures it. In the last three days, the Taiyin, Shaoyin, and Jueyin meridians receive the pathogen; the heat transmits to the interior, and purging cures it. The transmission of the Six Meridians proceeds from shallow to deep, consisting entirely of heat syndromes, with no Yin-cold syndromes. The ancient sages taught that Yin and Yang form exterior-interior relationships; only Zhang Zhongjing profoundly grasped this meaning. Later, Zhu Gong's *Huo Ren Shu* specifically deviated from Zhang Zhongjing's original intent, interpreting the terms Yin and Yang as Cold and Heat. This slight error led to a massive deviation. The *Su Wen · Re Lun* (Treatise on Heat Diseases) states: The Yellow Emperor asked: Heat diseases all belong to the category of Shang Han. Some recover, some die; deaths occur within six to seven days, while recoveries occur after ten days. Why is this? I do not understand the explanation; I wish to hear the reason. Qibo replied: Ju Yang is the leader of all Yang meridians; its vessels connect to the Fengfu (GV16, Wind Palace) acupoint, thus serving as the master Qi of all Yang meridians. When humans are injured by Cold, they develop heat diseases. Even if the heat is severe, death does not ensue; however, those who suffer from simultaneous contraction of Cold in both Exterior and Interior (Liang Gan Yu Han) will inevitably die. The Yellow Emperor said: I wish to hear the clinical manifestations. Qibo said: On the first day of Shang Han, Ju Yang receives the pathogen, causing headache, stiff neck, and rigidity of the waist and spine. On the second day, Yangming receives the pathogen; Yangming governs the muscles, and its vessels run alongside the nose and connect to the eyes, causing fever, eye pain, nasal dryness, and inability to lie down. On the third day, Shaoyang receives the pathogen; Shaoyang governs the Gallbladder, and its vessels follow the costal region and connect to the ears, causing hypochondriac pain and deafness. When the meridians of the Three Yang are all affected but have not entered the Zang organs, sweating can cure it. On the fourth day, Taiyin receives the pathogen; Taiyin vessels distribute in the stomach and connect to the throat, causing abdominal fullness and dry throat. On the fifth day, Shaoyin receives the pathogen; Shaoyin vessels pass through the Kidneys, connect to the Lungs, and tie to the root of the tongue, causing dry mouth and tongue with thirst. On the sixth day, Jueyin receives the pathogen; Jueyin vessels follow the genitalia and connect to the Liver, causing irritability, fullness, and retraction of the scrotum. When the Three Yin and Three Yang, and the Five Zang and Six Fu organs are all diseased, Ying and Wei circulation stops, and the Five Zang become obstructed, death ensues. For those not suffering from simultaneous contraction of Cold: on the seventh day, Ju Yang disease declines, headache lessens; on the eighth day, Yangming disease declines, body heat lessens; on the ninth day, Shaoyang disease declines, deafness improves slightly allowing hearing; on the tenth day, Taiyin disease declines, abdominal fullness decreases returning to normal, appetite returns; on the eleventh day, Shaoyin disease declines, thirst stops, bloating ceases, tongue dryness resolves, and sneezing occurs; on the twelfth day, Jueyin disease declines, scrotum relaxes, lower abdomen softens, pathogenic Qi departs, and the illness heals day by day. The Yellow Emperor asked: How should it be treated? Qibo replied: Treatment requires regulating the meridians of each respective Zang organ; the disease will decline day by day. If the duration is less than three days, sweating can cure it; if the duration exceeds three days, purging can cure it.