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1. The etiology of Bi syndrome (a disease characterized by pain, numbness, and heaviness) lies in the combination of Wind, Cold, and Dampness pathogens. The Five Bi syndromes refer to Bi conditions affecting the skin, vessels, muscles, sinews, and bones respectively. When Wind pathogen predominates, it is called Moving Bi syndrome (characterized by wandering pain); when Cold pathogen predominates, it is called Painful Bi syndrome (characterized by severe pain); when Dampness pathogen predominates, it is called Fixed Bi syndrome (characterized by heavy limbs difficult to lift). Symptoms such as skin numbness, muscle stiffness, discoloration of vessels, sinew contracture, and bone heaviness occur upon exposure to pathogens. If exposed to pathogens again, the disease may penetrate into the Zang-Fu organs. Zhou Bi syndrome (Bi syndrome with pain moving up and down along the meridians) shares similarities with Mai Bi syndrome (Bi syndrome caused by vessel obstruction), but its location is fixed, unlike Mai Bi syndrome which shifts from left to right.

[Annotation] The cause of the Three Bi syndromes is the mixed invasion of Wind, Cold, and Dampness pathogens. When Wind pathogen predominates, the pain wanders, hence it is called Moving Bi syndrome. When Cold pathogen predominates, the pain is extremely severe and bitter, hence it is called Painful Bi syndrome. When Dampness pathogen predominates, the pain is fixed and heavy, hence it is called Fixed Bi syndrome. These are named according to their etiological factors, collectively known as the Three Bi syndromes. There is also the concept of Five Bi syndromes, referring to Pi Bi (Skin Bi), Mai Bi (Vessel Bi), Ji Bi (Muscle Bi), Jin Bi (Sinew Bi), and Gu Bi (Bone Bi). If these pathogens are encountered in Autumn leading to Pi Bi, the skin is numb but still slightly sensitive to pain and itching. If encountered in Summer leading to Mai Bi, blood circulation within the vessels is impaired, resulting in discoloration. If encountered in Late Summer leading to Ji Bi, the muscles become stiff and numb, losing sensitivity to pain and itching. If encountered in Spring leading to Jin Bi, the sinews contract, joints ache, and flexion/extension is restricted. If encountered in Winter leading to Gu Bi, the bones feel heavy and sore, making lifting impossible. "Entering the Zang-Fu organs" refers to internal transmission to the five Zang organs. If Pi Bi persists and re-exposure occurs, the pathogen enters the Lung, forming Fei Bi (Lung Bi syndrome). If Mai Bi persists and re-exposure occurs, the pathogen enters the Heart, forming Xin Bi (Heart Bi syndrome). If Ji Bi persists and re-exposure occurs, the pathogen enters the Spleen, forming Pi Bi (Spleen Bi syndrome). If Jin Bi persists and re-exposure occurs, the pathogen enters the Liver, forming Gan Bi (Liver Bi syndrome). If Gu Bi persists and re-exposure occurs, the pathogen enters the Kidney, forming Shen Bi (Kidney Bi syndrome). These are named based on the season of onset and the affected site, collectively known as the Five Bi syndromes. The "pathogens" referred to here are the repeated exposure to Wind, Cold, and Dampness. Zhou Bi syndrome also resides within the blood vessels, causing disease by moving up and down along the meridians; thus, it resembles Mai Bi syndrome, but the pain has a fixed location, unlike Mai Bi syndrome which shifts laterally. In modern times, Gout, Liu Huo (a condition resembling erysipelas or acute cellulitis), and Li Jie Feng (a condition resembling rheumatoid arthritis) are all common names for Moving Bi syndrome.