One type of Bi syndrome that can be classified into wandering Bi. Li Jie (Feng) is caused by invasion of wind–cold–damp in the meridians and collaterals leading to Qi and blood blockage. Its manifestations are migrating severe joint pain and swelling, red and hot affected joints that are unable to move smoothly, and pain that is worse at night. Li Jie (Feng) might be seen in conventional medicine classified under diseases such as rheumatic fever or rheumatoid arthritis.