The most common causes of joint pain in the index finger of both hands are tenosynovitis, gout and carpal tunnel syndrome. 1. Tendovaginitis: If the patient repeatedly performs hand work for a long period of time, resulting in excessive friction between tendons and tendon sheaths, tendovaginitis will easily be formed, which will be manifested as pain and stiffness in the joints, and the symptoms will be relieved after activities, and the range of motion of the joints will also decrease when the symptoms are serious. 2. Gout: If the patient has a history of gout, repeated attacks of gout will easily form gout stones in the joints, which will cause stiffness of the index finger joints with obvious pain. 3. Carpal Tunnel Syndrome (CTS): The compression of the median nerve in the carpal tunnel due to various factors will easily cause pain in the index finger and other joints, weakness in holding objects, and usually accompanied by numbness and stiffness in the finger joints. Causes of pain in the index finger joints of both hands are more reasons, may also be related to osteoarthritis, trauma and other factors, if the symptoms continue without relief, it is recommended to go to the hospital in time to find out the cause of the disease, by the doctor targeted treatment.