The tendon sheath is a tubular synovial capsule on the surface of the long tendon. The tendon sheath is divided into two layers, the outer layer is the fibrous sheath and the inner layer is the synovial membrane, which serves to lubricate and reduce friction during muscle activity and protect the tendon. Tenosynovitis occurs when the tendon sheath becomes congested, edematous, and exudates as a result of excessive friction between the tendon and the tendon sheath, which is wrapped around the tendon in daily life and work. Tendonitis should belong to the orthopedic soft tissue disease category, so go to the hospital directly registered orthopedics can be. Mild tendinitis can be relieved by adequate rest, movement of the injured area, or massage. If the pain is not relieved after rest, prompt medical attention and, if necessary, surgery are required.