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The five types of Wei syndrome (flaccidity syndrome) all arise from Lung heat; without pathology in the Yangming channel, they cannot form. Lung heat scorches the lung leaves and causes the skin and hair to wither, leading to flaccidity where movement is impossible. Heart heat leads to Mai Wei (pulse flaccidity), characterized by laxity of the lower leg joints. Kidney heat leads to Gu Wei (bone flaccidity), characterized by the inability to raise the waist and spine. Liver heat leads to Jin Wei (tendon flaccidity), characterized by tendon spasms and loss of nourishment. Spleen heat leads to Rou Wei (muscle flaccidity), characterized by muscle numbness, dryness, thirst, and frequent drinking.

[Note] The "Five Weis" refer to the flaccidity syndromes associated with the Heart, Liver, Spleen, Lung, and Kidney. Wei syndrome belongs to dryness diseases, thus arising from Lung heat. The Yangming channel is the sea of the five zang and six fu organs, primarily moistening the Zong jin (major tendons). If the Yangming channel has no pathology, the Zong jin are moistened, capable of binding the bones and facilitating joint movement; even with Lung heat, Wei syndrome cannot form. Lung heat scorches the lung leaves, combined with Yangming deficiency, preventing the transformation of body fluids. Without nourishment for the sinews and bones, the skin and hair wither and become flaccid, resulting in limb flaccidity and inability to walk. Consequently, Heart qi heat becomes Mai Wei (pulse flaccidity), causing the lower leg joints to be lax and unable to bear weight on the ground; this is Lung disease combined with Heart disease. Consequently, Kidney qi heat becomes Gu Wei (bone flaccidity), causing the waist and spine to be unable to rise or lift; this is Lung disease combined with Kidney disease. Consequently, Liver qi heat becomes Jin Wei (tendon flaccidity), causing the sinews to lose nourishment, spasm, and fail to extend; this is Lung disease combined with Liver disease. Consequently, Spleen qi heat becomes Rou Wei (muscle flaccidity), causing stomach dryness and thirst, and muscle numbness; this is Lung disease combined with Spleen disease.

Wei syndrome affects the feet, whereas Bi syndrome (painful obstruction syndrome) affects the body; the distinction lies in the presence or absence of pain. Observing that ancient treatments for Wei syndrome do not use wind-dispelling herbs reveals that the etiologies of deficiency and excess are distinct.

[Note] The conditions of Wei syndrome and Bi syndrome are often considered one disease today due to their similarities. However, Wei syndrome presents with flaccidity and weakness in both legs without pain, while Bi syndrome involves pain throughout the limbs and joints. Observing that ancient practitioners did not use wind-dispelling herbs when treating Wei syndrome indicates that Wei syndrome is mostly deficiency, whereas Bi syndrome is mostly excess, and their causes differ.

Why treat Wei syndrome, a dryness condition, with methods for damp-heat? Follow the classics by exclusively targeting the Yangming channel. If the Yangming channel is healthy, Lung heat will only affect the Lung, not cause Wei syndrome. Thus, those suffering from Wei syndrome must have pathology in the Stomach/Yangming. This may be damp-heat, accumulated heat, or damp-phlegm. Regardless of whether it is new or chronic, if the Stomach is strong and appetite is good, first examine the syndrome and apply purgative methods. For damp-phlegm in the Stomach, use Kong Xian Dan (Phlegm-Controlling Pill) to purge. For damp-heat, use Xiao Wei Dan (Minor Stomach-Purging Pill). For accumulated heat, use the Three Chengqi Decoctions method. This is the method for treating strong Stomachs with good appetite. If the Stomach is weak with reduced intake, leading to insufficiency of Qi, blood, and body fluids, prioritize tonifying and nourishing the Spleen and Stomach. For prolonged lingering illness with various deficiencies and dryness-heat, or for regulation after purgation, examine the syndrome and treat accordingly to achieve full efficacy.

Jia Wei Er Miao Tang (Modified Two Marvels Decoction): Treats Wei syndrome caused by damp-heat, where the two legs are flaccid and the heat is unbearable. Ingredients include Fangji (Stephaniae Tetrandrae Radix), Danggui (Angelicae Sinensis Radix), Chuan Bixie (Dioscoreae Hypoglaucae Rhizoma), Huangbai (Phellodendri Cortex), Guiban (Testudinis Carapax et Plastrum), Niu Xi (Achyranthis Bidentatae Radix), Qin Jiao (Gentianae Macrophyllae Radix), and Cang Zhu (Atractylodis Rhizoma).

[Note] "Heat unbearable" refers to the intense heat in the two legs. "Xi Qin Cang" refers to Niu Xi, Qin Jiao, and Cang Zhu.

Qing Zao Tang (Clear Dryness Decoction), Hu Qian Wan (Tiger's Latent Pill), Shi Quan Da Bu Tang (Ten Complete Great Tonifying Decoction), Jia Wei Jin Gang Wan (Modified Diamond Pill): For seasonal damp-heat, Qing Zao Tang is effective; for Yin deficiency with damp-heat, Hu Qian Ling is efficacious; for prolonged deficiency and flaccidity, Shi Quan Da Bu Tang is primary. Ingredients for the latter context include Bixie, Gualou, Niu Xi, Tusizi, Duzhong, and Rongcongrou.

[Note] Qing Zao Tang is recorded in the Internal Injury section. Hu Qian Wan exists as a established formula. "Quan Jin Zhu" refers to Shi Quan Da Bu Tang and Jia Wei Jin Gang Wan. For prolonged illness with Qi and Blood deficiency, Shi Quan Da Bu Tang is primary; for sinew and bone flaccidity, Jia Wei Jin Gang Wan is primary. Jia Wei Jin Gang Wan consists of Bixie, Mugua, Niu Xi, Tusizi, Duzhong, and Rongcongrou.