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Lijie Feng (Joint Pain Wind), characterized by severe joint pain, is said to have miraculous efficacy with Wuji San (Five Accumulations Powder) in medical texts. However, if warm and drying agents are administered, the disease will worsen. One may use Gan Ge (Puerariae Radix), Dong Teng (Lonicerae Japonicae Caulis, also known as Jin Yin Hua / Honeysuckle Stem), and Yang Huo (Epimedii Folium, i.e., Horny Goat Weed) as substitutes. (Ye Tianshi noted in *Bencao Jing Jie* that Epimedii Folium soaked in wine treats hemiplegia.)

Bi Syndrome (Obstruction Syndrome) is a disease caused by the combination of Wind, Cold, and Dampness pathogens; it presents with pain accompanied by numbness. Among these three pathogens, Dampness is predominant. It is appropriate to treat it with Er Chen Tang (Two-Aged Decoction) added with Cang Zhu (Atractylodis Rhizoma), Bai Zhu (Atractylodis Macrocephalae Rhizoma), and Fang Feng (Saposhnikoviae Radix). Alternatively, the treatment method for Lijie Feng can be borrowed. Huang Qi Wu Wu Tang (Astragalus Five-Ingredient Decoction) from *Jin Gui Yao Lue* is used to treat Blood Bi (Blood Obstruction Syndrome); however, it is also a general formula for Bi syndromes belonging to deficiency patterns. Taking it for more than twenty doses will surely yield results.

(Classical Theory Basis) *Su Wen: Bi Lun* states: "The combination of Wind, Cold, and Dampness forms Bi Syndrome. When Wind predominates, it is called Xing Bi (Wandering Bi); when Cold predominates, it is called Tong Bi (Painful Bi); when Dampness predominates, it is called Zhuo Bi (Fixed Bi)." *Ling Shu: Zhou Bi Pian* states: "Zhou Bi (General Bi) resides within the blood vessels, moving up and down along the meridians, unable to spread left or right, staying where it is." Later scholars used one jin (approx. 500g) of black soybeans soaked in water until sprouted, dried, roasted until fragrant, and ground into powder. Mixed with wine, one qian (approx. 3.7g) is taken orally three times daily. Furthermore, *Bi Lun* states: "Bao Bi (Bladder Bi) manifests as internal pain upon pressing the lower abdomen and bladder area, feeling as if scalded by hot water, with difficult and scanty urination, and clear nasal discharge above. Chang Bi (Intestinal Bi) manifests as frequent drinking but inability to urinate, abdominal distension and borborygmus, and occasional stool containing undigested food." It also states: "When Yang qi is abundant and Yin qi is scarce, pathogenic qi prevails; Yang encounters Yin, thus forming Re Bi (Hot Bi)."

Bi (meaning obstruction) leads to pain, hence named Tong Bi (Painful Bi). Wuji San (Five Accumulations Powder) warms and unblocks (when unblocked, there is no pain), following ancient methods. Besides Cang Zhu, Bai Zhu, and Er Chen Tang removing Dampness, Huang Qi Wu Wu Tang (Astragalus Five-Ingredient Decoction) is exquisite and refined.

He Xi Feng (Crane Knee Wind) refers to thin calves and swollen knees. It is formed by Wind, Cold, and Dampness combining to cause Bi obstruction in the knee. It is appropriate to borrow methods for treating Bi syndrome and Lijie Feng. If in the early stage, Bai Jie Zi (Sinapis Semen) can be ground into powder, mixed with Ginger Juice and Scallion Juice, and applied topically. After one fu shi (approx. 2 hours), blisters will form on the affected area; once the blisters dry and peel off, it will heal spontaneously. For those with weakness, Shi Quan Da Bu Tang (Comprehensive Great Tonifying Decoction) added with Fu Zi (Aconiti Lateralis Radix Praeparata), Fang Feng (Saposhnikoviae Radix), Niu Xi (Achyranthis Bidentatae Radix), Du Zhong (Eucommiae Cortex), and Du Huo (Angelicae Pubescentis Radix) should be used. This condition belongs to the Three Yin meridians. Although the Three Yang meridians govern the interior, Wind, Cold, and Dampness all come from outside, so it is listed among exterior syndromes.