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Yu Chang said: When the pathogenic factors of the Six Excesses (Wind, Cold, Summerheat, Dampness, Dryness, Fire) develop into Jing disease (a syndrome characterized by stiffness and spasm of the neck and back, trismus, and opisthotonos), it is one of the most common, profound, severe, and confusing syndromes. The medical principles of Huangdi (Yellow Emperor), Qibo (Grand Duke Qi), and Zhang Zhongjing are profound beyond measure, yet later generations largely fail to comprehend them. Consequently, people act without restraint, making baseless speculations; one sings and another echoes, leading to a succession of premature deaths. Is this not using the art of saving lives to kill? It is precisely because differentiation was not performed early enough. "Jing" means stiffness. It was later named "Chi" (synonymous with Jing, referring to tendon spasms), which is an error of transmission. The *Suwen* states that various Jing syndromes presenting with neck stiffness belong to Dampness, indicating that the pathogenesis is primarily governed by Dampness. The *Qianjin Fang* expands on this meaning, stating that if Taiyang Wind-stroke is compounded by Cold and Dampness, it transforms into Jing. Noting that Taiyang Wind-stroke involves profuse sweating, or failure to change clothes when sweaty, allowing Cold and Dampness to invade internally, or being re-exposed to seasonal Cold and terrestrial Dampness, thereby transforming into Jing, this approach combines Wind, Cold, and Dampness to discuss Jing. The *Jingui Yaolue* titles its chapter "Jing, Shi, and E," combining Heat, Summerheat, and Dampness in its discussion. However, the mentioned Rou-Jing (Soft Jing) and Gang-Jing (Hard Jing) do involve Wind and Cold. It also states that excessive sweating can cause Jing, implying that since people sweat naturally in summer, one must be especially cautious against excessive diaphoresis. Ancient and modern texts on Jing are limited to these works. Later, Wang Haicang discussed Jing, acknowledging Zhang Zhongjing as his source; although his insights were not fully comprehensive, he was undoubtedly a sage of broad vision. The *Shanghan Lun* records five clauses on Jing disease, which have already been clarified in the *Shanglun Pian*. Here, I will elaborate on the ten additional clauses added in the *Jingui Yaolue*, whose purport is now clear. However, given the enduring confusion throughout history, if I do not establish a treatise to dispel doubts, my heart remains unsatisfied. Indeed, Zhang Zhongjing’s discussion of Jing disease focuses solely on the Taiyang channel. Later physicians treating this disease argue that since the Taiyang channel runs along the back, neck stiffness and back arching belong to Taiyang, and thus they use the Guizhi Jia Gegen Tang (Cinnamon Twig plus Kudzu Decoction) and Gegen Tang (Kudzu Decoction) from the *Jingui Yaolue*. These treatments often fail to produce results, and practitioners frequently blame Zhang Zhongjing for incompleteness, failing to realize that exogenous Six Excess pathogens transmit from Taiyang through the Six Channels as a natural progression; the pathogen does not cease until transmission is complete. Therefore, all Three Yang and Three Yin channels can lead to Jing. Zhang Zhongjing’s writings are full of insight; though not explicitly stated, his implicit meanings are vividly apparent. For instance, when Taiyang transmits to Yangming, causing neck and back stiffness (described as "Ji Ji"), or Shaoyang presents with neck stiffness, it is evident that all Three Yang channels can suffer from Jing. Do not the Three Yin channels also experience this? Wang Haicang stated that the Three Yang channels and Taiyin channel can suffer from Jing, omitting Shaoyin and Jueyin. He claimed that back arching belongs to Taiyang; lowering the head to look down, with limbs pulling together and elbows/knees meeting, belongs to Yangming; unilateral eye deviation with limb twitching belongs to Shaoyang; fever, deep/thready pulse, and abdominal pain belong to Taiyin. He used Fangfeng Danggui Tang (Saposhnikovia and Angelica Decoction) for Taiyang/Yangming Jing caused by excessive sweating, and Chaihu Jia Fangfeng Tang (Bupleurum plus Saposhnikovia Decoction) for Shaoyang Jing following failed sweating therapy with alternating chills and fever. Although he omitted Shaoyin and Jueyin, his formulations such as Fuzi San (Aconite Powder), Guixin Baizhu Tang (Cinnamon Heart and Atractylodes Macrocephala Decoction), and Fuzi Fangfeng San (Aconite and Saposhnikovia Powder) imply their relevance. His note under Baizhu Tang—"Upper resolves the Three Yang, lower stabilizes Taiyin"—reveals his intent: he likely believed transmission to Shaoyin and Jueyin inevitably leads to death. Yet, how can one restrict pathogenic transmission like wind and rain by drawing boundaries? Moreover, many patients with Shaoyin and Jueyin Jing survive. The *Lingshu* states that the foot-Shaoyin tendon system runs along the interior of the spine, up to the vertex, merging with the foot-Taiyang tendons. Pathology here manifests as inability to bend forward and Jing. External Yang pathology prevents bending forward; internal Yin pathology prevents extending backward. Thus, foot-Shaoyin (Zang) and foot-Taiyang (Fu) are interconnected; inability to bend indicates Taiyang governs the exterior, while inability to extend indicates Shaoyin governs the interior—a precise differentiation. The *Suwen* also notes Taiyang governs the exterior on day one, implying Yangming and Shaoyang follow suit for the exterior. Shaoyin governs the interior, implying Taiyin and Jueyin follow for the interior. Zhang Zhongjing identified head/back stiffness and inability to bend as Taiyang Jing, encompassing the Three Yang. He identified body/leg curling and inability to extend as Shaoyin Jing, encompassing the Three Yin. This is indeed "leading without revealing," vividly present in mind and eye. The *Suwen* describes Kidney disease as prone to distension, where the patient sits on the buttocks instead of heels, and bows the spine instead of lifting the head, vividly depicting the Shaoyin inability to extend. Wang Haicang’s classification of downward gaze and elbow-knee convergence as Yangming Jing is inaccurate, as these are signs of Yin pathology preventing extension. Furthermore, Zhang Zhongjing stated that in Shaoyin disease with diarrhea, if diarrhea stops spontaneously, accompanied by aversion to cold and curling up, but with warm hands and feet, it is treatable. Also, if there is aversion to cold, curling up, occasional irritability, and desire to remove coverings, it is treatable with warming methods. Regarding Taiyang syndrome, if only back aversion to cold is seen, before curling occurs, one should urgently warm the Yin to prevent inability to extend. In Shaoyin syndrome, if dry mouth/throat or pure watery diarrhea appears, before neck/back stiffness occurs, one should urgently purge the Yang to prevent inability to bend. When Zang Yin is excessive, Fu organs show signs first; when Fu Yang is extreme, entering Zang leads to withering. These are matters of divine clarity. Later sages pondered these principles but could not articulate them, showing the difficulty of rising from Sagehood to Perfection, unlike fools who easily fall into abyssal absurdity. Consider children, whose fragile constitution cannot withstand high fever from exogenous pathogens, often developing Jing. Later practitioners erroneously named this "Jing Feng" (Convulsive Wind), inventing theories of "Four Syndromes generating Eight Signs." They misidentified Jing symptoms: head shaking and hand rigidity as convulsive jerking; sudden trismus and foot cramping as spasms; back arching as opisthotonos. Pediatricians adopted this blindly, and families accepted it passively. Instead of treating exogenous pathogens, they administered mineral, borneol, and musk drugs, resulting in death after every attempt, without realization. Similarly, postpartum women, with empty blood reservoirs, are susceptible to external Wind invasion, causing Jing. Zhang Zhongjing clearly stated this, yet ignoramuses ignored the sages, falsely diagnosing "Postpartum Convulsive Wind" and administering wrong medicines, again leading to death without awakening. I spare no effort to guide others with precious knowledge, yet those who refuse guidance turn hostile. How lamentable!