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The Shu Mai (Rapid Pulse) is characterized by a rapid respiratory and pulse rate, feeling forceful upon pressing and lifting. It primarily indicates an excess condition where Yang Qi is hyperactive, fire is blazing, and consuming the True Yin. A Floating pulse indicates disease in the Exterior, while a Deep pulse indicates disease in the Interior; treating via diaphoresis for the Exterior or purgation for the Interior, if the pulse matches the symptoms, treatment is not difficult. However, when only a Rapid pulse appears, it often falls into a realm of suspicion between true and false, where the difference between life and death is as vast as heaven and earth, yet most people do not understand this. If the pulse feels weak upon pressure (not drumming), it is caused by the interplay of deficiency and cold; a Rapid, large, and deficient pulse indicates the depletion of Essence and Blood; a fine and rapid pulse indicates Yin deficiency with dryness resembling Yang heat; a Deep, wiry, fine, and rapid pulse indicates the critical stage of consumptive disease approaching death. There is also the Kuai Mai (Fast Pulse), which is synonymous with the Ji Mai (Hasty Pulse); the Fast/Hasty pulse resembles the Rapid pulse but is not truly Rapid. In cases of false heat, if cooling agents are mistakenly administered, the pulse may also appear Rapid. It is common to see physicians in the world who, upon detecting a rapid and hasty pulse, fail to distinguish between new and old diseases, strength and weakness, and whether the pulse drums under pressure. They indiscriminately administer bitter-cold herbs, abruptly destroying Stomach Qi, how can they not hasten the patient to death? Xu Donggao stated: "Rapid pulses mostly indicate ominous signs; only if uniform and robust is it acceptable. It is suitable only for Shanghan (Cold Damage), pregnancy-related malaria, and pediatric cases." Li Shizhen's Binhu Maixue (Pulse Studies from Binhu) states: "Rapid pulses belong to Yang Heat, known clearly; one should treat using Ministerial Fire and Sovereign Fire. Excess conditions suit cooling purgation, while deficiency suits warming tonification. For Lung disease in late autumn, one fears it." Based on this, there have been instances of using warming tonification. If one merely says to treat using Ministerial and Sovereign Fire, the insight is still shallow and unexpanded. Are there not severe cases of Yang deficiency and Yin excess that present with a洪 (Surging), Rapid, and forceful excess pulse, requiring urgent warming with Guizhi Tang (Cinnamon Twig Decoction) and Fuzi (Prepared Aconite Root), resulting in immediate recovery? I cautiously cite again the discussion from the Seimen and Maixian chapters of Neijing (Inner Canon) to correct these errors and save those wrongly treated, delivering a painful needle to contemporary physicians. The Classic states regarding Winter pulses: "When the Qi comes like a flicking stone, this is called Excess, disease is in the Exterior; when it goes like a Rapid pulse, this is called Deficiency, disease is in the Interior." The explanation clarifies: "Coming like a stone means the arrival is firm and strong, indicating Excess of Ying (Nutritive) Qi; going like a Rapid pulse means movement and cessation are hurried, indicating Deficiency of Ying Qi." Generally, Rapid pulses belong to Heat, but here, due to True Yin deficiency, the pulse must also be hurriedly Rapid. The more Rapid, the more deficient; the more deficient, the more Rapid; this is not the Rapid pulse of Yang hyperactivity and excess Heat. Thus, it does not say "Rapid" but "Like Rapid," implying deep diagnostic discernment. If this condition improves even slightly, life and death hang in the balance. I believe it is not only the Rapid pulse that has similar counterparts; all other pulses such as Floating, Deep, Slow, Moderate, Slippery, Choppy, Deficient, Excess, Wiry, and Tight also have similarities. Nor is it only the pulse that is so; regarding symptoms, diseases resembling Malaria, Phlegm, Asthma, Wind Stroke, and Lin Syndrome, unless one is proficient in careful differentiation, these situations most easily shake the mind and eyes at the moment of practice. Therefore, mediocre and superficial practitioners only know the present appearance, while refined practitioners uniquely clarify the suspicious aspects. This difficulty in medicine lies precisely at this juncture.