There are many causes of pain in the first joints of the fingertips, including trauma, tenosynovitis, arthritis and so on. 1. Tenosynovitis: If it occurs in the finger, it is mostly seen in the tendon sheath tissue of the flexor tendon, which is mainly due to the aseptic inflammation of the joint arising from excessive finger flexion and extension labor, and is mostly seen in manual laborers, typists, and so on. In severe cases, it may cause enlargement of the finger joints, tenderness, joint pain, limitation of movement, and popping of the fingers. 2. Arthritis: It is common in degenerative disease of the finger joints, which causes narrowing of the first joint space and osteophytes, thus causing joint pain. 3. Trauma: such as collision, impact, etc. caused by the finger bone or interphalangeal soft tissue injury. In addition to the above reasons, rheumatoid arthritis, gout and other diseases can also cause the above symptoms. If the above symptoms are serious, or the symptoms persist without improvement, the patient should go to the hospital in time to identify the cause of the disease and undergo regular treatment.