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Question: Why is Jue Ni (cold extremities) classified as a Jue Yin syndrome resulting from transmitted disease? Answer: The pathogenic factor of Shang Han (Cold Damage) enters from the exterior to the interior. When the pathogen is in the Three Yang meridians, the hands and feet are hot; when it transmits to the Tai Yin meridian, the hands and feet are warm; when it reaches the Shao Yin meridian, they gradually become cold; and when it arrives at the Jue Yin meridian, cold extremities occur reversely. This is what is meant by "the deeper the heat, the deeper the cold extremities." From heat to warmth, from warmth to Jue (cold extremities), and from Jue to reverse coldness, this represents the transmitted pathogen progressing from shallow to deep. Thus, we know that Jue Ni belongs to the Jue Yin syndrome of transmitted disease. Another question: What about Jue Ni in cold syndromes? Answer: This is due to direct invasion by cold pathogens, where Jue occurs immediately, unlike the Jue of transmitted disease which develops gradually. Another question: Zhang Zhongjing stated, "Fever for four days, Jue for three days, then fever for four days; less Jue and more heat indicates the disease should heal; Jue for four days, fever for three days, then Jue for four days; more Jue and less heat indicates the disease should progress." What does this mean? Answer: This refers to Heat Jue. In Shang Han, fever indicates the heat is relatively superficial; Jue indicates the heat is deeper. This is the principle of "the deeper the heat, the deeper the Jue; the milder the heat, the milder the Jue." Less Jue and more heat means the heat is gradually receding; more Jue and less heat means the heat is advancing further. As for direct invasion by cold pathogens, Jue appears at the onset, unlike transmitted heat pathogens which start with fever before developing into Jue. In direct cold invasion, Jue and heat alternate irregularly without fixed progression or regression.

Question: Why is Xiao Ke (wasting-thirst) classified as a Jue Yin heat syndrome? Answer: Xiao Ke occurs because intense heat consumes water. When the pathogen transmits to the Tai Yin meridian, there is dryness in the throat but thirst is not severe; when it reaches the Shao Yin meridian, there is dry mouth and tongue with thirst; when it arrives at the Jue Yin meridian, Xiao Ke manifests. Xiao Ke is characterized by drinking much water but producing little urine, with no obvious place for the consumed water to go. This shows that when Jue Yin heat is intense, there is great thirst and the ability to consume water. Another question: The Three Yang meridians also present with thirst. Why? Answer: Tai Yang syndromes originally do not have thirst. If there is thirst accompanied by difficult urination, it is a Tai Yang Fu-organ disease. When Tai Yang exterior symptoms are present along with thirst, Wu Ling San (Five-Ingredient Powder with Poria) is used to promote diuresis, allowing urine flow to resume and thirst to cease. Yang Ming meridian diseases originally do not have thirst, only dry lips and a desire to rinse the mouth with water. If there is thirst, it is a Yang Ming Fu-organ disease. If the pathogen has not yet condensed and the heat is diffuse causing thirst, Bai Hu Tang (White Tiger Decoction) is used; if the pathogen has solidified causing abdominal distension and constipation with thirst, Cheng Qi Tang (Order the Qi Decoction) is used. These are the treatment methods for Yang Ming Fu-organ diseases. As for Shao Yang, it is the junction of exterior and interior. On the exterior it presents as cold, on the interior as heat. If accompanied by thirst, it indicates the pathogen is about to enter the interior. Therefore, Ban Xia (Pinellia Rhizome) is removed from Xiao Chai Hu Tang (Minor Bupleurum Decoction), Gua Lou Gen (Trichosanthes Root) is added to clear heat, and Ren Shen (Ginseng Radix) is doubled to generate fluids. This is the treatment method for Shao Yang meridian diseases. Regarding Tai Yin, although there is throat dryness, thirst is not severe; Shao Yin presents with dry thirst, which becomes increasingly severe; Jue Yin presents with Xiao Ke, which is the extreme of thirst and cannot worsen further. Another question: How to distinguish the great thirst of Yang Ming Fu-organ disease from the Xiao Ke of Jue Yin? Answer: Yang Ming resides in the center and corresponds to Earth, the gathering place of all things. Pathogens from the Three Yang and Three Yin meridians can all transmit to it. Now, the Xiao Ke of the Jue Yin meridian is actually caused by consumption in the Stomach. Food and drink enter the Stomach. Stomach heat leads to digestion/consumption, while Stomach cold prevents it. When Jue Yin pathogenic heat is extremely intense and attacks the Stomach Fu-organ, the symptom of Xiao Ke arises. It is not that the Liver meridian of Jue Yin has a separate mouth capable of drinking and consuming. Because it is accompanied by symptoms such as retraction of the genitals, irritability and fullness, and Jue Ni, it is named Jue Yin. Since Xiao Ke arises from the Jue Yin syndrome, Xiao Ke is attributed to Jue Yin. Another question: Intense heat sometimes presents without thirst. Why? Answer: This is due to extreme heat causing confusion of the spirit, where the patient is unaware of thirst. Initially, there is extreme thirst, but later the patient feels no thirst. With dry mouth and scorched lips, and a body like dead wood, the condition is critical. Another question: Direct invasion by cold syndromes can also present with thirst. Why? Answer: This is due to excess Yin repelling Yang to the upper part. The patient desires to drink but cannot swallow, termed false thirst. The patient is irritable and desires to sit in mud or water. This is true cold inside and false heat outside. Alternatively, excessive sweating or purgation may severely deplete body fluids, causing dryness in the Stomach and leading to a desire for water. The amount drunk is usually small, and the water is preferred warm. Additionally, in Shao Yin syndrome, deficiency-cold of the Kidney meridian leads to frequent drinking of hot liquids for self-rescue, following the principle of similar qi attracting each other. However, the urine is white, and exterior signs include undigested food in stool and Jue Ni. All the above conditions differ vastly from the genital retraction and Xiao Ke of Jue Yin, and must be distinguished clearly.