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The patient's body is hot, yet they desire to wrap themselves in clothes; this indicates heat on the skin and cold in the bone marrow. The patient's body is cold, yet they do not desire to wrap themselves in clothes; this indicates cold on the skin and heat in the bone marrow.

This clarifies the meaning of cold and heat discussed in the previous chapter: When Yin is excessive, there is internal cold and external heat; due to internal cold, the patient desires warmth. When Yang is excessive, there is internal heat and external cold; due to internal heat, the patient does not desire warmth. By observing whether the patient desires or rejects clothing, one can discern the nature of internal and external cold and heat. This corresponds to the saying in the *Suwen* (Plain Questions): "When examining a patient, ask about their comfort preferences." The terms "fever with aversion to cold" and "no fever with aversion to cold" mentioned in the previous chapter refer to exterior symptoms. Wind pathogenic factors injuring the Wei (Defensive) Qi often involve internal heat, while Cold pathogenic factors injuring the Ying (Nutritive) Blood often involve external cold. To prevent readers from focusing only on exterior symptoms while neglecting interior pathology, this chapter is presented for clarification.

Wind is the generating Qi of Heaven and Earth. When the pores are not yet open, wind acts as an external pathogen invading and injuring the Wei Yang, causing the apertures to open and the Wei Qi to leak. The nature of Wei Qi is descending and convergent; it wishes to close to protect the exterior, but wind causes it to leak externally. Unable to close, the wind invades the Yin positions internally, obstructing the Ying Blood, thereby causing disease. (The term "wind leakage" refers to wind closing the Wei, causing Ying stagnation and external leakage.)

In Taiyang disease, characterized by fever, sweating, aversion to wind, and a slow pulse, it is named Wind Strike (Zhong Feng).
The Taiyang meridian has a distinction between Ying and Wei: Ying circulates within the vessels, while Wei circulates outside the vessels. When Wind and Cold pathogens invade, they injure different aspects: Wind injures Wei, and Cold injures Ying. Injury to Wei closes off the Ying Blood, resulting in fever; injury to Ying closes off the Wei Qi, resulting in aversion to cold. If Ying is closed by Cold, there is no sweat; if Wei is agitated by Wind, there is sweat, because initially when Wei is closed, Ying stagnation can still vent outward. Sweating leads to the leakage of Wei Qi, resulting in exterior deficiency and aversion to wind and cold. The nature of Cold is coagulating and stagnant; contracting Cold causes the skin and hair follicles to close, resulting in a tight pulse. The nature of Wind is dynamic and dispersing; contracting Wind causes the meridian Qi to vent, resulting in a slow pulse.

The Lung communicates with Wei Qi. Wind injuring Wei promotes its dispersing function, preventing Wei Qi from converging, thus causing sweating. As Wei leaks more, the exterior becomes more closed; if closed and not opened, Ying stagnates and generates fever. Guizhi Tang (Cinnamon Twig Decoction) serves to unblock the meridians and vent Ying stagnation.

In Taiyang disease, presenting with headache, fever, sweating, and aversion to wind, Guizhi Tang (Cinnamon Twig Decoction) should be administered.
Wind is a Yang pathogenic factor, and Wei is Yang Qi; when Wind attacks humans, the Yang aspect is affected, thus injuring Wei Qi. Wei Qi derives from Lung Qi, and its nature is convergent. Wind agitates Wei Qi, causing it to lose its convergent function, leading to sweating. As Wind causes Wei to leak more, Wei converges inward more strongly, obstructing Ying Blood, which stagnates and steams into heat. This means Wei Qi is injured and Ying Blood is diseased. Therefore, although the pathology lies in Wei Qi, treatment focuses on Ying Blood. In Guizhi Tang, Gancao (Licorice Root) and Dazao (Jujube Fruit) tonify Spleen Essence to nourish Liver Blood; Shengjiang (Fresh Ginger) regulates the Zang-Fu organs and disseminates the meridians; Shaoyao (White Peony Root) clears heat in the Ying; and Guizhi (Cinnamon Twig) reaches and resolves Ying stagnation. Sweat is the result of Ying and Wei steaming and venting through the apertures. Once the apertures open and Ying stagnation vents outward, the Wind Strike condition is cured.