The back of the hand tendon pain vigilance fasciitis, tenosynovitis, tendon sheath cysts and other diseases. 1. Fasciitis: If you suffer from fasciitis in the back of the hand, it may cause aseptic inflammatory stimulation of the fascia of the back of the hand, which is mostly related to labor injury and cold, and also causes the clinical manifestation of tendon pain on the back of the hand, and the pain will be aggravated when you are active. 2. Tendovaginitis: the cause of excessive activity, around the tendon, there is an inflammatory reaction, part of the place may suffer from tendovaginitis. If the finger joints are frequently active, it may cause edema of the tendons on the back of the hand. If the edema occurs in the special sheaths, tendovaginitis may also occur, which may cause tendon pain on the back of the hand. 3. Tendon sheath cysts: cysts may appear in the tendon sheaths of the tendons of the back of the hand, resulting in a swelling sensation accompanied by pain. If you have tendon pain in the back of the hand, it is recommended to closely observe the situation, consult a doctor in time for any abnormalities, and follow the doctor’s instructions for targeted treatment.