Tenosynovitis occurs in the fingers and wrists. There are 3 main reasons for the formation of tendovaginitis. One, chronic strain or excessive activity in the fingers and wrist; two, prolonged hand-holding of hard objects and compression; and three, the anatomical structure of the tendon sheath, which is prone to tendon sheathing, with hard bones underneath and reinforced by strong ligaments on the surface. If there is too much activity, or if there is prolonged strain, or if there is pressure from holding hard objects in the hand, this can cause local damage to the tendon sheath and sterile inflammation can occur. If the inflammation is severe, tendon sheath stenosis can occur, with dysfunctional finger flexion and extension, sometimes with popping and ringing.