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[Outline] Zhang Zhongjing stated in the *Jin Gui Yao Lue* (Essential Prescriptions of the Golden Cabinet): Yin Du (Yin Toxin) is a disease characterized by bluish discoloration of the face and eye sockets, generalized body pain as if beaten with a club, and sore throat. If treated within five days of onset, it is curable; if treatment is delayed until the seventh day, it becomes difficult to cure. The primary formula is Shengma Biejia Tang (Cinnamon Twig and Turtle Shell Decoction), modified by removing Xionghuang (Realgar) and Shujiao (Sichuan Pepper).

[Commentary] Xu Shuwei said: Accumulated Yin Cold pathogenic factors affecting the lower part cause the Wei Yang (Defensive Yang) in the upper part to diminish. Consequently, symptoms include heaviness and coldness of the four limbs, abdominal pain, and pharyngeal discomfort. Alternatively, there may be distension and hardness in the epigastrium (Xin Xia), dry thirst, incessant spontaneous sweating, or occasional delirious speech. The fingernails, face, and tongue may appear cyanotic and black. The six pulses are deep and fine, beating seven times per respiration or more. Treat with Huanyang Tang (Restore Yang Decoction) and Tuiyin San (Dispel Yin Powder). In cases of severe Yin Du with sinking and exhaustion, the six pulses can only be felt when pressed deeply to the bone and disappear upon light pressure. If the pulse beats seven to eight times or more per respiration, or even becomes uncountable, the prognosis is poor. Moxibustion of two to three hundred moxa cones below the umbilicus is indicated, accompanied by hot-natured herbs to assist. If the hands and feet do not recover warmth and flexibility, it is also incurable.

Zhu Gong said: Coldness of the hands and feet, pounding pain in the umbilical and abdominal region, sore throat, vomiting, and diarrhea, body pain as if beaten with a club, or cold sweat with irritability and thirst, with a thready pulse nearly imperceptible, is named Yin Du. In the initial stage of Yin Du, the hands and feet are cold, the back is stiff, the throat hurts, and even gruel cannot be swallowed. The toxin attacks the Heart, causing heart and abdominal pain, shortness of breath, and extremity coldness (Jue Ni). Vomiting and diarrhea occur. Suitable formulas include Yindu Gancao Tang (Yin Toxin Licorice Decoction), Baizhu San (Atractylodes Macrocephala Powder), Fuzi San (Aconite Powder), Zhengyang San (Correct Yang Powder), Rougui San (Cinnamon Bark Powder), Huiyang Dan (Return Yang Pill), Fanyin Dan (Reverse Yin Pill), Tianxiong San (Aconite Root Powder), Zhengyuan San (Correct Origin Powder), and Tuiyin San (Dispel Yin Powder), selected according to the condition. Generally, Yin Du originates from deficiency-cold of the Kidney Qi, or spleen injury due to cold foods, external contraction of Wind-Cold, internal latent Yin combined with external Cold invasion, or external Cold leading to internal latent Yin. When both interior and exterior are Yin, Yang Qi fails to remain secure, resulting in headache, heavy sensation in the waist, eye pain, physical fatigue, cold extremities, incessant cold sweat on the forehead and dorsum of hands, irritability and thirst, mental confusion, and a sense of loss. Within two or three days, the patient might be able to walk without feeling particularly heavy. The pulses are generally deep, fine, and rapid, with the Chi (Cun Kou) position being short and small, while the Cun (Inch) position may be large, or all six pulses floating and large. If the pulses are floating and large, or deep but not particularly rapid upon pressing, it is not a Yin syndrome. Generally, Yang Du (Yang Toxin) Shaoyang disease presents with wiry, surging, and rapid pulses; Yin Du Shaoyang disease presents with deep, fine, wiry, and rapid pulses. This must be known. If cool-natured medicines are mistakenly administered, thirst and irritability will worsen. Patients with this condition must urgently take acrid-hot medicines, and peace will return within one or two days. If Yin Du deepens, symptoms become heavier: cold extremities, worsening abdominal pain, pharyngeal obstruction, epigastric distension and hardness, irritability and thirst, and incessant cold sweat.

When Yang is excessive, the body is hot without sweat; when Yin is excessive, the body is cold with sweat. Qibo stated: Excess Yang causes body heat, closed pores, coarse breathing, restlessness, no sweat, and heat. Excess Yin causes body cold, sweating, constant chilliness, frequent shivering, coldness leading to extremity coldness, and occasionally Zheng Sheng (repetitive, low-volume speech due to mental confusion). Fingernails and complexion are cyanotic and black. Six pulses are deep, fine, and rapid, beating seven times or more per respiration. For such symptoms, quickly apply moxibustion of two to three hundred cones to Qihai (CV6) and Guanyuan (CV4) acupoints, aiming for warm and relaxed hands and feet as the sign of efficacy. Continue selecting and administering the aforementioned formulas. Once interior and exterior are unblocked, Yang Qi recovers, and resolution occurs through profuse sweating. If Yin alone is excessive and Yang Qi suddenly cuts off, it is called Yin Du; if Yang alone is excessive and Yin Qi suddenly cuts off, it is called Yang Du. Generally, when Yin and Yang separate and cut off, only profuse sweating can restore the righteous Qi.

If Yin Du has deepened significantly and the condition is critical, with six pulses only detectable at the bone level and disappearing on light pressure, it is difficult to treat. Apply the scallion-warming method to the navel, or moxibustion of three to five hundred cones. If the hands and feet remain cold, it is truly incurable. If warmth returns to the extremities, administer the aforementioned hot-natured medicines to assist. If Yin Qi dissipates and Yang Qi returns, reduce the dosage of hot medicines and regulate the condition. Upon the sudden recovery of Yang Qi, irritability often occurs; cool medicines must absolutely not be used. For severe irritability, Fanyin Dan (Reverse Yin Pill) will settle it. Recognize this point to avoid errors.

Wang Haogu stated: Examining Zhang Zhongjing’s texts, although the name "Yin Du" exists, the described symptoms are merely bluish face and eyes, body pain like being beaten, and sore throat. There is no mention of extreme Yin-Cold symptoms. Furthermore, the prescribed formulas contain only Shengma (Cimicifugae Rhizoma), Gancao (Glycyrrhizae Radix), Biejia (Testudinis Carapax et Plastrum), and Danggui (Angelicae Sinensis Radix), without using strongly warming or hot medicines. Thus, Zhang Zhongjing’s "Yin Du" refers not to an Yin-Cold disease, but to contracting evil toxic qi from heaven and earth into the Yin meridians, hence the name. Later commentators assumed it referred to extreme Yin-Cold excess, citing Zhang’s descriptions of bluish face and merging them with treatments using Fuzi San (Aconite Powder) and Zhengyang San (Correct Yang Powder). I believe that while extreme Yin-Cold can be named Yin Du, it does not align with Zhang Zhongjing’s original intent. The Yin Du described by later authors differs fundamentally from Zhang’s description. Later descriptions involve internal injury from cold food, exposure to violent cold, overconsumption of cold-cooling medicines, or simultaneous internal and external cold injury, rather than contracting evil toxic qi from heaven and earth.

Lou Ying stated: Yin Du originates from Kidney Qi deficiency, sexual excess, or wind strike after consuming cold foods. Internal latent Yin combines with external Cold invasion, or external Cold leads to internal latent Yin. When both interior and exterior are Yin, Yang Qi fails to remain secure, causing headache, heavy waist, abdominal pain, eye pain, physical fatigue without significant heat, cold extremities, incessant cold sweat on the forehead and dorsum of hands, irritability and thirst, mental confusion, and a sense of loss. The patient might walk without feeling particularly heavy. All six pulses are deep, fine, and rapid; the Chi position is short; the Cun position may be absent. Or all six pulses are floating and large, or deep and large but not rapid upon pressing—this is not a Yin syndrome. Overconsumption of cool medicines worsens thirst and irritability. Urgently administer Huanyang Tuiyin (Restore Yang and Dispel Yin) agents for relief. The principle is tonifying deficiency and harmonizing Qi. Suitable formulas include Zhengyuan San (Correct Origin Powder), Tuiyin San (Dispel Yin Powder), and Wusheng San (Five Elements Powder). Yin syndromes should not induce sweating. However, if Qi is abundant, pulses are large, and fever persists, inducing sweating with medicine is permissible.

Li stated: When Shanghan (Cold Damage) enters the Three Yin meridians, the disease is deep and inevitably transforms into Yin Du. Symptoms include cold extremities, vomiting and diarrhea, absence of thirst, lethargy and unwillingness to lie down. Severe cases present with eye pain, Zheng Sheng (repetitive speech), headache with head sweat, photophobia, cyanosis of the face, lips, and nails, cold sweat on the dorsum of hands, epigastric hardness, pounding umbilical/abdominal pain, body pain as if beaten, and cold external genitalia. Treat with Gancao Tang (Licorice Decoction) and Zhengyang San (Correct Yang Powder). If Yang Qi suddenly recovers and irritability arises, use Poyin Dan (Break Yin Pill) or Fuyang Dan (Restore Yang Pill). Do not use cool medicines.

Wu Shou stated: Someone asked why Yin Du Shanghan is treated with Fuzi Tang (Aconite Decoction) taken cold. This is a treatment method for Yin extremity at the lower part and floating Yang at the upper part. I once treated a patient with Shanghan for over ten days, presenting with deep, fine pulses, warm hands but cold feet, constipation, flushed face, vomiting, irritability, and thirst, unable to retain any intake except one or two sips of cold water or one or two pieces of watermelon. After ingestion, vomiting occurred after a long delay. This indicated internal Yin-Cold forcing floating Yang upward, with lost fire accumulating in the chest and rushing up to the throat, causing flushed face, vomiting, and irritability. I used one large Fuzi (Aconiti Lateralis Radix Praeparata), wrapped in dough with ginger juice and baked熟, removed the skin and tip, sliced into eight pieces. Then decocted Renshen (Ginseng Radix) and Paogjiang (Zingiberis Rhizoma Preparatum) each at 3 qian, soaked the mixture in cold water, and administered it cold. The patient recovered immediately. The *Neijing* states: To regulate reversed cold and heat, cold and hot must proceed together. Thus, hot medicines taken cold: after swallowing, the cold nature dissipates, and the hot nature activates, curing the disease. Modern patients with Yin syndrome Shanghan often present with ambiguous symptoms. Initially, they dare not use Aconite, waiting until Yin is extreme and Yang is exhausted before using it, which is too late. Yin syndrome Shanghan begins with latent Yin inside due to sexual activity, compounded by external cold, making both interior and exterior Yin. With Yin Qi exclusively excessive, Yang Qi declines, resulting in deep pulses and cold feet. One must urgently use Renshen (Ginseng Radix) and Fuzi (Aconiti Lateralis Radix Praeparata) to benefit Yuan Qi, warm the Kidney, and scatter Cold. Without these two herbs, how can one save the patient? Scholar Xu emphasized that Zhen Qi (True Qi) is paramount. True Qi is the root of human life. If one does not examine the deficiency or excess of True Qi, but attempts to attack excess, or applies sweating/purging methods, or uses cold-cooling medicines to attack heat, the heat may not resolve, and Yin-Cold will arise again, leading to critical illness. Another prescription involves dripping rooster blood into wine without ash, drinking it to capacity, covering with clothes and blankets to induce sweating.

Wang Kentang stated: In cases where Yin Du deepens gradually, with cyanotic nails and black face, and pulses beating seven times per respiration, deep and fine: accumulated Yin affects the lower part, causing slight Yang to diminish in the upper part. Symptoms include cold extremities, worsening abdominal pain, pharyngeal obstruction, epigastric distension and hardness, irritability and thirst, incessant cold sweat, or occasional delirium. Nails and complexion are cyanotic and black. Six pulses are deep and fine, beating seven times per respiration. Quickly moxibustion Qihai (CV6) and Guanyuan (CV4) acupoints with two to three hundred cones, aiming for warm hands and feet as efficacy. Continue administering Wusheng San (Five Elements Powder), Huanyang San (Restore Yang Powder), and Tuiyin San (Dispel Yin Powder). In cases of sinking and exhaustion of Yin Du, symptoms are similar to previous gradual stages but heavier and difficult to treat. In cases of Yang hidden within Yin, initial symptoms include cold extremities, pounding umbilical pain, and body pain as if beaten. Although it is a Yin syndrome, if Yang pulses appear, there is a possibility of survival. Moxibustion of one hundred cones to Qihai (CV6) and Dantian (CV8) warms the hands and feet, restores Yang, and resolves through sweating. Someone asked: How can sliding and deep pulse states indicate physiological potential? I replied: Zhang Zhongjing said, "Xi yan chen ming yue hua" (Xi and Yan sinking is named Hua/Sliding). Why? Chen (Deep) is pure Yin; Xi (Closing/Combining) is correct Yang. Yin and Yang harmonize, hence named Hua. Ancients described Hua pulse as flowing smoothly back and forth, resembling the Shuo (Rapid) pulse. Zhang Zhongjing explained it in three words. These three characters are hard to understand. Xi means combining; opening then closing, so Xi is correct Yang. Chen means suddenly descending, so Chen is pure Yin. Just as Xi combines, suddenly it descends to Chen. Yan means suddenly/in an instant. Zhang Zhongjing’s discussion of the Hua pulse is accurate. His words have methodology; readers find them difficult, so they should ponder carefully.

Xu Bin stated: When Cold Evil directly strikes the Yin meridians and persists unresolved, it becomes Toxin, giving rise to Yin Bing (Yin Disease). The pathogen directly invades the Kidney, infiltrating the Liver and Spleen. The Cold Qi is biting and painful wherever it goes. The face and eyes are areas where the essence of the Liver and Spleen manifests. When Earth (Spleen) is invaded by Cold, Wood (Liver) overacts, resulting in bluish color. When Cold invades muscles and contends with Wei Qi (Defensive Qi), pain resembles being beaten. The throat also hurts because the Shaoyin Meridian ascends to the throat; thus, latent Cold causes throat pain. Although the Hou (pharynx/larynx area) belongs to Yang, severe pain causes Qi resonance. However, pathogens deepen through transmission; deepening makes it difficult to treat. Hence, "curable in five days, incurable in seven." Medicines used are Shengma (Cimicifugae Rhizoma) and Guijia (Chelonis Carapax), specifically removing Shujiao (Sichuan Pepper) and Xionghuang (Realgar). Because Yin Evil as Toxin, although Yin possesses Yin-irritability, warming is ineffective, and attacking is biased and rarely successful. Therefore, Shujiao’s warmth and Xionghuang’s ferocity are removed. Instead, Guijia (Turtle Shell) and Danggui (Angelicae Sinensis Radix) are used to enter the Liver, harmonize Yin, and stop pain. Shengma (Cimicifugae Rhizoma) and Gancao (Glycyrrhizae Radix) ascend and disperse from the Spleen to transform Cold. Direct suppression risks harshness and dryness; instead, acrid-pine qualities achieve dispersion and resolution.