Finger pain when bending may be due to tenosynovitis, synovitis, osteoarthritis and other diseases. 1. Tenosynovitis: tenosynovitis may be caused by chronic strain, trauma, infection, long-term labor and other factors. Patients may experience localized pain, pressure pain, limited movement of the affected joints and other symptoms, which are manifested as pain when the fingers are bent. 2. Synovitis: synovitis is a common disease that may be caused by infection, trauma, gout and other factors. The main symptoms of patients are localized joint swelling, pain, and some patients will have pain when they bend their fingers. 3. Osteoarthritis: the cause of osteoarthritis is not yet clear, may be due to inflammation, trauma, genetics, obesity and other factors. Patients will experience joint pain, morning stiffness, joint swelling and other symptoms, which are manifested as pain when the fingers are bent. There are many reasons for finger pain, and it is recommended that patients identify the cause of the disease in a timely manner. Once diagnosed, patients need to take into account their own situation and actively cooperate with doctors to take relevant treatment measures.