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Shake of the Head in Cold Damage. How to elucidate this? The head is the convergence point of all Yang meridians. The Qi of all Yang meridians ascends to the head, whereas the Qi of all Yin meridians reaches only the neck and chest before returning. If the Qi of the Yang meridians fails to regulate properly, it results in shaking of the head. There are three types of head shaking in Cold Damage, each indicating a different pathogenesis.

One type involves shaking the head while speaking, which indicates internal pain. Due to pain within, speaking exacerbates the discomfort, causing the head to tremble and shake when attempting to speak.

Another type presents as isolated head shaking, sudden lockjaw (trismus), and opisthotonos (backward arching of the back). This is Jing disease (Spasm Disease). It occurs because Wind pathogen is abundant in the upper body; since Wind has the nature of movement, it causes shaking. Internal pain is not caused by the pathogen itself but by the pain inducing the symptom; Jing disease is not a reversal syndrome but induced by Wind.

Regarding the case where Yang Qi remains exclusively above, the complexion appears dark like smoke, the eyes stare fixedly, and the head shakes: this is termed Heart Jue (Heart Exhaustion). The Heart houses the Shen (Spirit) and serves as the root of Yin. Yang roots in Yin, and Yin roots in Yang. When Yin and Yang mutually support each other, Ying (Nutritive) and Wei (Defensive) Qi follow each other up and down. Upon exhaustion, the Shen departs and Yin fluids are depleted. Without a root, Yang cannot maintain self-control, hence the head shakes. Wang Shuhe stated: "To nourish the shoots, one must consolidate the roots; to cut the roots, the tops will inevitably wither." Internally severing the root manifests externally as head shaking; what doubt could there be? Heart Jue is a true organ failure, whereas Jing disease from Wind and internal pain are manifestations of pathogenic factors. Observing head shaking requires further differentiation of auspicious or inauspicious prognosis.

Chorea-like Movements (Chi Zong) in Cold Damage. How to elucidate this? "Chi" refers to tendon and vessel contraction/tightness; "Zong" refers to relaxation/looseness. Tightness leads to pulling and shrinking; looseness leads to extending and stretching. Alternating between shrinking and extending, with continuous motion, is named Chi Zong. Commonly known as "Chu" (twitching). The *Huangdi Neijing* states: "When diseases involve tendons and vessels pulling and contracting tightly, it is named Chi Zong." "Chi" implies fitting together like a tenon and mortise; walking makes them loose, lying down makes them tight; following the condition allows extension. "Zong" implies letting go freely; rapid extension is described as such. Taking tightness as Chi and looseness as Zong, the principle is clear. Chi Zong belongs to Wind diseases, and epilepsy also involves Chi Zong. Chi Zong in Cold Damage is due to extreme excess of Evil Heat. Excessive Heat combines with Wind in the meridians; since Wind is active, the four limbs undergo Chi Zong restlessly. Therefore, those suffering from Feng Wen (Wind-Warmth) treated incorrectly with fire therapy may develop a slight yellow hue; severe cases resemble convulsive epilepsy with intermittent Chi Zong, describing the extreme abundance of Heat. When Cold Damage progresses to Chi Zong, the disease momentum has passed its peak and is often difficult to control. The *Neijing* states: "When Taiyang Qi terminates, symptoms include upward staring eyes, opisthotonos, Chi Zong, and the emergence of Jue Han (Exhaustion Sweat), large like beads on a string, adhering to the body without flowing." Witnessing such Chi Zong indicates a disease that has reached an advanced/exhausted stage. There is also a condition called Si Xi (trembling/flapping of limbs), where limbs move continuously, resembling Chi Zong but lacking strength and unable to extend or contract; this is Liver Jue (Liver Exhaustion). Although Chi Zong is difficult to cure, if agents that dispel Wind and purge Heat are used to reduce the intense Heat, recovery is possible. If cauterization is wrongly applied, or diaphoretic medicines are drunk, death will follow instantly. The Canon states: "One error may prolong life for a day; two errors hasten the time of death."