Common causes of pain in one of the joints of the fingers are fingertip arthritis, gout, tenosynovitis, and so on. 1. Fingertip arthritis: Disease, trauma, excessive activity, etc. cause cartilage damage, the smooth surface is traumatized and repaired by new bone, as a result, the joint movement is blocked and pain occurs. 2. Gout: Finger pain caused by large amounts of uric acid and urates gathered in the blood and tissues. 3. Tenosynovitis: due to excessive finger movement, the finger flexor tendons in the tendon sheath repeatedly friction caused by edema, in the process of pulling, aseptic inflammation, which in turn causes pain. There may be other causes of pain in one of the joints of the fingers, it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, and standardized treatment under the guidance of the doctor.