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Contemporary physicians, upon observing patients who experience fever after sexual exertion or seminal emission, followed by exposure to wind and cold, label this condition as "Yin Syndrome" (Yin Zheng). Patients encountering such symptoms also self-diagnose as Yin Syndrome. Disregarding the actual clinical manifestations, they uniformly administer potent warming and tonifying herbs such as Renshen (Ginseng Radix), Baizhu (Atractylodis Rhizoma), Fuzi (Aconiti Lateralis Radix Praeparata), Rougui (Cinnamomi Cortex), Ganjiang (Zingiberis Rhizoma), and Dihuang (Rehmanniae Radix). This approach is truly absurd.

The so-called Yin Syndrome refers to Cold Pathogens invading the Three Yin Meridians (Taiyin, Shaoyin, Jueyin). After sexual activity, if one contracts wind, does it necessarily mean the wind-cold invades the Kidney Meridian? Even if it does, it merely involves dispersing wind-cold from the Shaoyin Meridian. As stated in *Shanghan Lun* (Treatise on Cold Damage Disorders), for Shaoyin fever, formulas containing Mahuang (Ephedrae Herba) and Xixin (Asari Radix et Rhizoma) are still used to release the exterior. How could one employ pungent-warming tonification methods? If warming tonification is used, it would effectively trap the wind-cold pathogen within the Kidneys.

Furthermore, when individuals with Yin Deficiency contract wind-cold, the pathogen inevitably enters via the Taiyang Meridian and remains a Yang Pathogen. The fever will likely be severe, accompanied by dryness, chest oppression, irritability, and thirst. In such cases, clearing heat and dispelling pathogens is particularly appropriate; how can hot-natured drugs be used instead? If the pathogen directly invades the Three Yin Meridians, there would absolutely be no high fever. Instead, symptoms such as aversion to cold, fatigue, desire to lie down, cold extremities, and preference for warmth would appear. Only then could warming dispersion be employed, yet even then, tonification should ultimately not be used.

Consider the case of "Nü Lao Fu" (Female Labor Recurrence), where chills and fever recur after recovery from Shanghan due to imprudent sexual intercourse. This affects individuals who have been chronically deficient and are now suffering from a major illness. By contemporary standards, potent tonification seems indicated. However, ancient texts prescribe treating this with Zhupi (Bambusae Caulis in Taedia), one sheng, decocted and taken orally. Therefore, those who are not ill but contract wind after sexual activity should certainly not use hot-tonifying methods.

Thus, the principle of treatment always depends on the current signs and pulse. If the six pulses are deep and slow, and there is aversion to cold throughout the interior and exterior, indicating a true Cold Syndrome of the Three Yin Meridians, treatment should follow the Yin pattern, even if the patient has a strong constitution and has abstained from sex for ten years. Conversely, if the presenting pulse and symptoms indicate a Yang Pathogen—manifesting as fever, irritability, and thirst, without any signs of the Three Yin Meridians—treatment should follow the Yang pattern, even if the patient is inherently weak and has suffered excessive sexual exertion. For instance, in *Shanghan Lun*, Yangming disease characterized by intense heat requires formulas like Gegen Tang (Puerariae Decoction) or Baihu Tang (White Tiger Decoction). If the condition shifts to the Three Yin Meridians within moments, the treatment must switch to warming tonification. If a Yang syndrome transitions to another Yang syndrome, cooling dispersion is used. This is an immutable rule.

Among modern practitioners, only Master Yu Jiayan understood this principle, as evidenced by the Shanghan medical case of Huang Changren in his work *Yuyi Cao*. Others fail to grasp this concept, and the number of lives lost due to their ignorance is incalculable!