Tendon cysts are not bursitis, and there are differences in the nature, etiology, and clinical symptoms between the two. Tendon cyst is a cystic swelling in the tendon area, which is mainly related to strain, trauma, pathogenic microbial infection, long-term inflammatory stimulation, connective tissue dystrophy and other reasons. Patients are prone to cysts on the dorsum of the wrist, the palm of the wrist, the popliteal fossa, the dorsum of the foot, the knee joint, etc. The surface is smooth, and there are no obvious symptoms at first, but if the size of the cysts increases, symptoms such as pain, sensory disorders, and limited movement will occur. Bursa is a kind of independent connective tissue flat capsule, bursitis refers to a variety of reasons on the bursa caused by stimulation, so that the damage caused by the inflammation manifestations, often occurs in the shoulder suture, eagle’s beak, hip, knee, heel and other places. The cause of bursitis is similar to tendon cysts, but there are also different causes such as gout and rheumatoid arthritis. Patients experience swelling, stiffness, and pain in the affected joints, which can worsen with movement or pressure. To summarize, tendon cysts and bursitis are two different diseases, and patients should undergo further examination to clarify the specific cause.