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The principle of pulse taking lies in flexibility and adaptability. (Pulse, referred to as Jing Sui (meridian tunnels) in the *Nei Jing* (Inner Canon), later called Jing Mai (meridians) by subsequent authors. Lin Zhihan pointed out it as the loose areas within muscles, containing Ying Qi (nutritive qi), serving as the road for ceaseless day-and-night operation, thus carrying the pulse.) If one is rigid and inflexible, diseases become difficult to predict. Let us discuss from the perspective of positions: For instance, the Left Cun (Cun position on the left wrist) corresponds to the Heart region, where the pulse reflects the condition of the Heart and Dan Zhong (Pericardium); the Right Cun corresponds to the Lung region, reflecting the Lungs and Chest Middle; the Left Guan (Guan position on the left wrist) corresponds to the Liver region, reflecting the Liver and Gallbladder; the Right Guan corresponds to the Spleen region, reflecting the Spleen and Stomach; the Left Chi (Chi position on the left wrist) corresponds to the Kidney region, reflecting the Kidneys, Bladder, and Small Intestine; the Right Chi corresponds to the San Jiao (Triple Burner) region, reflecting the Kidneys, San Jiao, Ming Men (Gate of Life), and Large Intestine. Above the Cun position is Yu Ji (Fish Border), and below the Chi position is Chi Ze (Pool Marsh). Therefore, observing the two Cun pulses allows one to know diseases of the head, face, throat, teeth, headache, shoulders, and back; observing the Guan pulses allows one to know diseases of the hypochondrium, abdomen, and back; observing the Chi pulses allows one to know diseases of the waist, abdomen, vagina, feet, and knees. This is what is meant by "upper parts reflect upper regions, middle parts reflect middle regions, lower parts reflect lower regions." (*Nei Jing* states: The inner sides of the Chi area correspond to the lateral costal margins. The outer side of Chi reflects the Kidneys, and the inner side reflects the abdominal cavity. Attached above, the left outer side reflects the Liver, and the inner side reflects the Diaphragm; the right outer side reflects the Stomach, and the inner side reflects the Spleen. Further up, the right outer side reflects the Chest, and the inner side reflects the Chest Middle; the left outer side reflects the Heart, and the inner side reflects Dan Zhong. The anterior aspect reflects the anterior body, and the posterior aspect reflects the posterior body. The extreme upper end corresponds to matters of the chest and throat; the extreme lower end corresponds to matters of the lower abdomen, waist, thighs, knees, and shins. Zhang Jingyue said: The Small Intestine and Large Intestine are both Fu organs of the lower part, naturally corresponding to the two Chi positions. Since the two intestines connect to the Stomach, their Qi is continuous, so the *Nei Jing* does not specify fixed locations but states that the Large and Small Intestines belong to the Stomach, implying that the Qi of the two intestines is observed within the Stomach Qi. Since Wang Shuhe combined the Heart with the Small Intestine at the Left Cun, and the Lungs with the Large Intestine at the Right Cun, this error is significant. Xi notes: Discussing the connection of meridians and vessels, the Large and Small Intestines should naturally be diagnosed at the two Cun positions; discussing the upper-lower positions of pulses, they should be diagnosed at the two Chi positions. However, Lin Zhihan of Wucheng exclusively promoted Wang Shuhe's *Mai Jing*, based on the theory that due to meridian continuity, they should be diagnosed at the Cun position, recording this in *Guan Kui Fu Yu*. Although his reasoning is hard to refute, he used it to disparage other schools' views on diagnosing the intestines at the Chi position to highlight his unique insight. This not only contradicts the *Nei Jing* but also creates the flaw of reversing upper and lower.) Nevertheless, the pulses of the Five Zang and Six Fu organs are all governed by the Lungs. Although the Lungs are merely one of the Five Zang organs, they are actually the assembly point of Qi. Therefore, the one-fen portion before the Right Guan is called Qi Kou (Qi Gate), and its diagnosis can predict one's entire life. (Wu Caolu said: Pulse circulation starts at the Lungs, ends at the Liver, and returns to assemble at the Lungs. The Lungs are the gateway for Qi emission, hence named Qi Kou, and serve as the great assembly of pulses to predict lifelong fortune.) Moreover, various Qis cannot reach the Lungs by themselves; they must rely on the water and grain essence from the Stomach for transport and irrigation. Thus, the Stomach is the transformation of Pre-Heaven Qi and the root of Post-Heaven Qi, governing all Qis. It is often seen that individuals with Yin deficiency and blood depletion take Liu Wei Di Huang Wan (Six-Ingredient Rehmannia Pill) and Si Wu Tang (Four Substance Decoction) daily without gaining the benefit of nourishing Yin. The reason lies precisely here. Shouldn't we seek beyond the six positions and focus on diagnosing the Qi Kou and Stomach Qi? (This highlights that Stomach Qi is the key to pulse diagnosis. Stomach Qi is Grain Qi. When Grain Qi decreases, Stomach Qi is about to perish; how can Blood be generated? Nowadays, people frequently use Si Wu Tang without considering dietary intake, thereby obstructing the source of Blood generation, which is common. *Jing Mai Bie Lun* states: Food Qi enters the Stomach, Jing Qi returns to the Lungs. The Lungs direct the Hundred Vessels, and Qi returns to balance. When balanced, Qi Kou forms an inch-length pulse, determining life and death. *Ying Wei Sheng Hui* states: Humans obtain Qi from grain. Grain enters the Stomach, transmits to the Lungs, and the Five Zang and Six Fu organs all receive its Qi. The clear part becomes Ying Qi (Nutritive Qi), the turbid part becomes Wei Qi (Defensive Qi). Ying Qi circulates within the vessels, while Wei Qi circulates outside.) Ming Men Fire (Ministerial Fire) resides on the right, and Kidney Water resides on the left; however, the Kidneys share the seventh vertebral level, governing both Yin and Yang, Essence and Qi, storing and sealing, allowing each to perform its function. Can the Kidneys be diagnosed solely on the left and not on the right? When taking pulses at all three positions (Cun, Guan, Chi) to form Nine Probes (Jiu Hou), whether superficial or deep, interior or exterior, these manifest differently in the floating, moderate, and deep levels of the six positions. This is essentially "exterior reflects exterior, interior reflects interior, middle reflects middle." Is it true that only Cun being Yang and Chi being Yin can govern interior and exterior? Headaches located above should naturally appear in the Cun pulse. However, Shaoyang (Lesser Yang) and Yangming (Bright Yang) headaches may appear in the two Guan pulses. (When pathogenic factors transmit to the Foot-Shaoyang Gallbladder Meridian, headache appears at the Left Guan; when transmitting to the Foot-Yangming Stomach Meridian, headache appears at the Right Guan.) Taiyang (Greater Yang/Bladder) headaches may appear at the Left Chi. Thus, pain located above cannot be confined strictly to the upper positions. Lin syndrome (dysuria) and enuresis located below should naturally be sought in the Chi pulse. However, due to Qi deficiency failing to hold, the disease may bias toward the Right Cun; due to Spirit decline failing to consolidate, it may bias toward the Left Cun. Thus, conditions located below cannot be confined strictly to the lower positions. When Middle Qi is deficient causing vomiting and diarrhea, vomiting seems related to the Cun pulse, and diarrhea to the Chi pulse; why should treatment focus on the Guan pulse to strengthen the Spleen and Stomach? When Yin and Yang Qi mix and block the central pathway, treatment should target the two Guan pulses; why should one prioritize ascending the clear to follow Yang and bitter descending to seek Yin? Therefore, diseases in the upper, middle, and lower parts cannot be entirely confined to the observed positions. Positions are so difficult to confine. (Xi notes: Floating pulses at all six positions can reflect the Heart and Lungs; deep pulses at all six positions can reflect the two Kidneys; moderate pulses at all six positions can reflect the Liver and Spleen. Furthermore, Kidney pulses sometimes appear floating or at the Cun position; Heart and Lung pulses sometimes appear deep or at the Chi position; Liver and Spleen pulses sometimes appear floating or deep at the Cun or Chi positions. Wang Zongzheng said: Pulse diagnosis should follow the principle that Heart and Lung pulses are generally floating, Kidney and Liver pulses are generally deep, and Spleen resides in the Central Region. If Wang Shuhe exclusively relied on Cun, Guan, and Chi positions to diagnose diseases, it is highly inappropriate.)