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The disease characterized by stiffness and opisthotonos (backward arching of the body) is named Jing Disease (Spasm). Upon examination, Jing Disease resembles Shanghan (Cold Damage), but differs in that it predominantly features backward arching of the back. Treatment must differentiate between exterior/interior, yin/yang, deficiency/excess, and cold/heat. The *Jingui Yaolue* states that Taiyang disease presenting with fever, anhidrosis (absence of sweating), and aversion to cold is named Gang Jing (Stiff Spasm); fever with sweating and no aversion to cold is named Rou Jing (Soft Spasm). This nomenclature distinguishes between Cold-Dampness injuring the Ying (Nutritive) level and Wind-Dampness injuring the Wei (Defensive) level based on the presence or absence of sweating. Although the text does not explicitly mention diaphoresis (sweating-inducing therapy) or releasing the muscle layer, careful study of the original text of the first chapter reveals that establishing the theory based on sweating versus non-sweating implicitly suggests treating Taiyang Shanghan via both diaphoresis and releasing the muscle layer under the same principles. However, Jing Disease occurs not only in winter but also in spring, summer, and autumn; therefore, acrid-warm herbs like those in Mahuang Tang (Ephedra Decoction) and Guizhi Tang (Cinnamon Twig Decoction) for inducing sweat and releasing the muscle layer are not explicitly prescribed. Furthermore, because Jing Disease involves rigid spasms, often due to insufficiency of Ying and Wei levels and invasion by external pathogens, drastic diaphoresis to release the exterior is contraindicated. Hence, the next chapter states: "Taiyang disease, with fever and a deep, thin pulse, is named Jing Disease, and is difficult to treat." This implies that for Jing Disease caused by Taiyang fever, dispersing the exterior is the correct treatment. If the pulse is deep and thin, dispersing the exterior cannot be used, hence it is difficult to treat. From this, we can see that if Taiyang fever-induced Jing Disease presents with a floating, tight, and large pulse, dispersing the exterior method can still be used, and it would not be termed difficult to treat. The following text further states: For Taiyang disease with fever and anhidrosis, sweating should originally be induced; however, if the pulse is deep and thin, inducing heavy sweating may lead to Jing Disease due to excessive fluid loss. For wind-strike syndrome with fever and sweating, if the pulse is deep and thin, purgation may also induce Jing Disease. Patients with sores who experience body pain, if the pulse is deep and thin, mistaken diaphoresis will also result in Jing Disease. Even if all Taiyang disease symptoms are present, if the pulse is deep and slow, only Gualou Guizhi Tang (Trichosanthes Root and Cinnamon Twig Decoction) should be used. The repeated warning regarding deep and thin pulses indicates that both diaphoresis and purgation are prohibited. However, the following text states: "Taiyang disease with anhidrosis, accompanied by scanty urination, qi rushing upward to the chest, trismus (lockjaw), and inability to speak, indicating impending Gang Jing, is treated with Gegen Tang (Kudzu Decoction)." This clause mentions only anhidrosis, not a deep/thin pulse; thus, Gegen and Mahuang are still used to release the exterior of the Taiyang and Yangming channels. This clearly indicates that for Gang Jing with fever, anhidrosis, and aversion to cold from the first chapter, if the pulse is not deep and thin, exterior-releasing methods remain applicable. The following text states: "In Jing Disease, if there is chest fullness, trismus, inability to lie flat (body does not touch the bed), calf cramping, and teeth grinding, Da Chengqi Tang (Major Order the Qi Decoction) may be given." This clause mentions neither anhidrosis nor a deep/thin pulse, clearly indicating that for Rou Jing with fever and sweating from the first chapter, if the pulse is not deep and thin but rather solid and large, Da Chengqi Tang can still be used for purgation. The first chapter warns that if Jing Disease presents with a deep/thin pulse, even Gang Jing with exterior signs cannot use Mahuang Tang. Similarly, Rou Jing with fever and sweating cannot use Guizhi Tang. This chapter warns that for Gang Jing with fever, anhidrosis, and a large, non-deep/thin pulse, if sweating was indicated but missed, Gegen Tang and Mahuang-containing formulas are re-established. It also warns that for Rou Jing with fever, sweating, and a rapid, non-deep/thin pulse, if purgation was indicated but missed, Da Chengqi Tang is re-established. These dual warnings show that Zhang Zhongjing relies on the presence or absence of sweating, and whether the pulse is floating/thin, floating/large, deep/thin, or deep/solid, to determine interior/exterior and deficiency/excess, thereby detailing exterior-releasing and interior-purging methods. Haizang (Zhang Yuansu) defines mouth locking and opisthotonos as Taiyang Jing; head drooping and downward gaze as Yangming Jing; unilateral strabismus and limb convulsions as Shaoyang Jing. His intent seems to be assigning the back to Taiyang, the anterior chest to Yangming, and eye deviation to Shaoyang to define meridian involvement. However, neck stiffness frequently belongs to Yangming; the Yangming meridian enters the inner canthus, and its pathways cross bilaterally. Both eyes can deviate, so this cannot be taken as an absolute conclusion. Danxi (Zhu Zhenheng) advocated Ren Shen (Ginseng Radix) and Zhu Li (Bambusa Textilis Sap) for treatment, which applies to internal injury-induced Jing Disease where blood dryness fails to nourish the meridians. Xue Xinpu (Xue Ji) utilized Xie Qing Wan (Drain Green Pill), Yi Gong San (Differentiated Attack Powder), Liuwei Wan (Six-Ingredient Pill), Xiaoyao San (Free and Easy Wanderer Powder), Siwu Tang (Four Substance Decoction), Guipi Tang (Restore the Spleen Decoction), San Yi Chengqi Tang, and his family secret Shujin Tang (Relax Tendons Decoction). These are all for internal injury-induced Jing Disease, differentiating deficiency/excess for tonification/purgation, and do not apply to Jing Disease caused by external Six Evils. Now, I have detailed Zhongjing’s discussion on Jing Disease previously, and subsequently described the theories of these three masters, thereby covering all aspects of external Six Evils and internal injuries causing Jing Disease. Reading the *Shanghan Lun*, I saw Zhongjing established his theory on winter Shanghan, mentioning Wind-Damp and Wind-Warmth, but omitting cold/heat diseases of other seasons. Reading the *Jingui Yaolue* Jing Disease chapter, I saw Zhongshi (Damp Strike), Damp-Heat, and Zhongshu (Heat Stroke) listed later. In my work *Shanghan Dabai*, comparing the *Jingui Yaolue* Jing Disease chapter, I first establish the opening volume with theories on Shanghan, Cold-Heat, and Warm-Thermal diseases, supplementing with Ban (Maculae/Rash), Jia Shi (Food Retention), and Jing Disease appended afterward, thus completing the coverage of all externally contracted pathogenic conditions.