Early morning pain when bending the fingers may be caused by rheumatoid arthritis, tenosynovitis, arthritis and other causes. 1. Rheumatoid arthritis: it is a chronic, systemic autoimmune disease with erosive, symmetrical polyarthritis as the main clinical manifestation. It may be caused by heredity, environment, etc. Due to the stimulation of inflammation, it may appear as pain when bending the fingers in the early morning. 2. Tenosynovitis: chronic aseptic inflammatory changes in the tendon sheath due to repeated mechanical friction. Due to the stimulation of inflammation, local pain, swelling and activity limitation are the main symptoms, which can cause pain when bending the fingers in the morning. 3. Arthritis: because of trauma, infection and other causes of joint inflammation, when the finger joints appear inflammation, can appear red, swelling, heat, pain and other phenomena, so there can be early morning finger bending pain. Finger bending pain in the morning may also be caused by other reasons, such as gout, etc., it is recommended to go to the hospital in a timely manner, in accordance with the doctor’s instructions for treatment, to avoid delaying the condition.