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The *Huangdi Neijing* (Yellow Emperor's Inner Canon) states: Wind is the chief of all diseases, characterized by its ability to move freely and change rapidly. It further states: When injured by wind, the upper part of the body is affected first. It also states: Deficient evil and thieving wind affect the Yang aspect first.

Chen Wuyue stated: The classic text mentions "injury by wind in spring," which follows the order of the four seasons. Wind follows the meridians and transmits daily, similar to cold damage (Shanghan). However, cold causes blood to congeal, resulting in anhidrosis (absence of sweating) and aversion to cold; wind disperses Qi, resulting in spontaneous sweating and aversion to wind. This constitutes their difference. Zhang Zhongjing distinguished between cold damage and wind injury within the Taiyang Meridian, but later compilers did not categorize them separately, referring to all Taiyang diseases as cold damage. Now, a separate category for "wind injury" is established to avoid confusion.

Wind is the vast energy of heaven and earth; the changes of the eight winds across the four seasons are constant. Occasional injuries occur primarily because one fails to adhere to the path of purity and stillness, leading to loose interstices (Couli) and deficiency of exterior Yang—this is the first cause. Another cause is the presence of internal deficiency-phlegm-heat, where Qi stagnates, making it easy for wind evil to bind from the exterior—this is the second cause. The classic states: "Maintaining purity and stillness closes and repels the internal interstices; even with great wind and severe toxins, harm cannot be inflicted." This refers to the aforementioned principle.

If exterior deficiency leads to wind invasion, using exclusively dispersing drugs will inevitably cause excessive sweating and loss of Yang Qi. If wind injury involves internal phlegm-heat, both interior and exterior must be treated simultaneously; relying solely on exterior resolution is inappropriate. The interstices are lax and leaky, making one susceptible to external pathogens without realizing it. One should consolidate Wei Qi (Defensive Qi) while simultaneously dispersing wind evil, such as with Guizhi Tang (Cinnamon Twig Decoction).

For the Foot-Taiyang Bladder Meridian, use Guizhi Tang (Cinnamon Twig Decoction). For the Foot-Yangming Stomach Meridian, use Xingzi Tang (Apricot Seed Decoction). For the Foot-Shaoyang Gallbladder Meridian, use Chaihu Jia Gui Tang (Bupleurum Plus Cinnamon Twig Decoction). For the Foot-Taiyin Spleen Meridian, use Guizhi Shaoyao Tang (Cinnamon Twig and Peony Decoction). For the Foot-Shaoyin Kidney Meridian, use Guifu Tang (Cinnamon Twig and Aconite Decoction). For the Foot-Jueyin Liver Meridian, use Bawu Tang (Eight-Ingredient Decoction).
All the aforementioned formulas are based on the three ingredients of Guizhi Tang (Cinnamon Twig Decoction), added with herbs specific to each meridian, establishing them as warming and dispersing agents.

The *Tun Jing* states: A pulse that is floating and large indicates wind. The *Quanyu* states: A floating and moderate pulse accompanied by nasal congestion indicates wind injury.

(Zhang Zhongjing) Guizhi Tang (Cinnamon Twig Decoction) treats spontaneous sweating due to wind injury in the Taiyang Meridian.
Guizhi (Cinnamon Twig), Shaoyao (Peony Root) (each 2 qian), Gancao (Licorice Root) (1 qian).
Take two cups of water, add three slices of ginger and one jujube, decoct, and take orally.
Guizhi Shaoyao Tang (Cinnamon Twig and Peony Decoction), Chaihu Jia Gui Tang (Bupleurum Plus Cinnamon Twig Decoction), Xingzi Tang (Apricot Seed Decoction), Guifu Tang (Cinnamon Twig and Aconite Decoction) (the above four formulas are seen in the Cold Damage section).
Bawu Tang (Eight-Ingredient Decoction) (seen in the Deficiency Damage section).