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The *Classic of Medicine* (*Huangdi Neijing*) states: "Excess leads to harm; only through subordination is there control." This refers to the dangers of excess. This matter lies between the ambiguity of flourishing and declining, how can the practitioner neglect it! The term "excess" (*Kang*) refers to being overly ascending without descending. The term "subordination" (*Cheng*) means receiving or bearing; when excess reaches its extreme, it is counter-controlled. For instance, Fire normally controls Metal. If controlled excessively, it becomes "excess," and since Water is the offspring of Metal, Water can control Fire. Taking advantage of Fire's deficiency, Water retaliates for its mother element, and thus Fire is controlled by Water. This is comparable to King Fuchai of Wu, who mobilized the entire nation's army to contend with Jin, believing himself invincible, while King Goujian of Yue took advantage of his emptiness and had already entered the state capital. How should this be understood in pulse diagnosis? It is said: When Yang is excessive, the pulse must be surging and large (*Hongda*). When Yang reaches its extreme, the pulse反而 becomes hidden and concealed, which is "Yang extreme resembling Yin." This corresponds to the top nine line of the Qian hexagon in the *I Ching*: "An arrogant dragon will have cause to repent." If this syndrome occurs in *Shanghan* (Cold Damage) disease, it may be due to improper sweating or purgation therapies, causing Yang Qi to become excessively亢盛 and depressed within, presenting symptoms resembling a Yin syndrome: dry lips and tongue, ability to drink fluids, constipation with hard stools, and dark, scanty urination. However, although the pulse is deep, pressing to the bone reveals it must be slippery, rapid, and forceful. Examining the excrement, the odor is exceptionally foul. There may be intermittent restlessness and heat, aversion to clothing and bedding, waving hands and kicking feet, and incessant delirious speech. Is there any doubt this is a Yang syndrome? Therefore, the classic states: "A pulse that is slippery and rapid, striking the fingers with force upon pressure, is not cold; this is called 'Yang excess repelling Yin'." When Yin is excessive, the pulse must be fine and minute (*Xixiao*). When Yin reaches its extreme, the pulse反而 becomes restless and rapid, which is "Yin extreme resembling Yang." This corresponds to the top six line of the Kun hexagon in the *I Ching*: "Dragons fight in the wild." In *Shanghan* disease, if cool/cold medicines are mistakenly administered, clearing heat too rapidly, and the patient originally has Kidney deficiency with cold invasion, it transforms into a Yin syndrome. This forces the floating fire to manifest externally, resembling a Yang syndrome: red face and irritability, spontaneous diarrhea, pale yellow urine, vomiting, regurgitation, shortness of breath, monotonous speech (*Zhengsheng*), and sore throat. However, the pulse upon pressure must be deep, fine, slow, and minute. Examining the thirst, the patient desires water but cannot drink it. Is there any doubt this is a Yin syndrome? Therefore, the classic states: "Body heat with a rapid pulse, but lacking the striking force under pressure, is not heat; this is called 'Yin excess repelling Yang'." Thus, it is known that whatever reaches an extreme tends to assume the characteristics of the element that controls it. It depends on the careful speculation of the scholar-practitioner, so that all syndromes can be thoroughly discerned as true or false.