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The *Huoren Shu* (Book of Vitality) states: In cold damage diseases, when yin is excessive and repels yang, the patient's body becomes cold, the pulse is fine, deep, and rapid, accompanied by irritability but without a desire to drink. It further states: Generally speaking, Yin Toxin arises from deficiency-cold of kidney qi, or from spleen injury due to cold foods, combined with external contraction of wind-cold, causing yang qi to fail in its guarding function. This leads to headache, heavy sensation in the waist, abdominal pain, eye pain, bodily fatigue, cold extremities, incessant sweating, or excessive thirst with irritability, and mental confusion. If cooling medicines are mistakenly administered, thirst intensifies, and restlessness becomes more urgent. Patients with this condition must urgently administer acrid-hot medicines. Sometimes there is "zheng sheng" (repetitive speech), with cyanotic nails and dark complexion. If the Yin Toxin has penetrated deeply and the disease is critical, with six pulses palpable only upon deep pressure against the bone (present on light touch but absent on heavy press), one should apply the scallion moxibustion method at the umbilicus, or perform three hundred moxa cones. If the limbs remain cold despite this, the condition is incurable. Liu Wansu (Zhenzhu) stated: After purgation, if heat persists, or if internal accumulated heat is extreme, leading to severe Yang Jue (Yang Reversal), yang qi becomes constrained and fails to circulate to the body surface and four limbs. This results in whole-body coldness, unbearable pain, stiffness and tension in the neck and back, red and painful eyes, dizziness and mental confusion, dry or painful throat, dry thirst with deficient sweating, vomiting and diarrhea, abdominal fullness and solid pain, vexation and mental disorder, panting, and repetitive speech. Because the accumulated heat is extremely deep and the pulse pathway is obstructed, the pulse is fine and deep, nearly imperceptible. Laypeople, unaware of the underlying mechanisms, mistakenly diagnose it as Yin Toxin. Alternatively, failure to purge early leads to extreme heat, resulting in a cold body and faint pulse, with coma approaching death. Urgent purgation would cause residual yin to abruptly cease and yang to exhaust subsequently, leading to immediate death; failing to purge also leads to death. At this stage, life hangs in the balance. So, what should the treatment be? The answer is: Use Liang Ge San (Cool the Chest Powder) or Huang Lian Jie Du Tang (Coptis Decoction for Detoxification) to nourish yin and subdue yang. As long as the accumulated heat is gradually dispersed, the heart and abdomen will warm up, and the pulse will gradually recover. Once the pulse regains strength, Yi San Cheng Qi Tang (Three-One Bowel-Regulating Decoction) can be used for mild purgation, or Jie Du Jia Da Cheng Qi Tang (Detoxification Plus Major Bowel-Regulating Decoction) is even better. Laypeople, misunderstanding this, mistake it for a yin syndrome, thereby missing the correct treatment. In the *Suwen: Wu Yun Yun Da Lun* (Basic Questions: Great Treatise on the Movement and Operation of the Five Phases), Qibo said: When qi is in excess, it controls what it normally overcomes and insults what it cannot overcome; when qi is deficient, what normally overcomes it takes advantage to insult it, and what it normally overcomes also lightly insults it. Excess wood controls earth and insults metal; since metal does not contend, wood relies on its excess to bully metal. Conversely, when wood is deficient and metal is strong, earth counter-injures wood, as wood is insufficient and subject to wrongful aggression. The four qi share the same origin. ("Insult" refers to arrogance and neglect.) It also states: Fire smelts metal; extreme heat transforms into water. It further states: Hyperactivity brings harm; only through succession/subordination can control be maintained.