The possible causes of tendon pain are chronic tendon injury, stenosing tenosynovitis and synovitis of the wrist joint. 1. Chronic injury of tendon: it may be due to the tendon undergoes slight trauma for a long time, or the tendon itself has chronic wear and tear, resulting in tendon fiber degeneration, thinning, tendon rupture, resulting in chronic injury of tendon, which causes tendon pain and pain when you make an effort. 2. Stenosing tenosynovitis: tenosynovitis of the fingers and wrist is often triggered by long-term, over-exertion activities of the fingers or wrist joints, such as laundry, knitting, playing musical instruments, typing, etc., which leads to this phenomenon. 3. Wrist synovitis: it may be caused by infection or trauma, etc. Wrist synovitis will trigger dorsal pain when the wrist is flexed, and the phenomenon will appear. There may be other reasons for the pain in the hamstring, it is recommended to go to the regular hospital in time to improve the relevant examination, to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.