Swelling of finger joints and morning stiffness may be caused by tendovaginitis, rheumatoid arthritis, tendonitis and other diseases. 1. Tenosynovitis: It is a chronic aseptic inflammatory change of tendon sheath due to repeated mechanical friction. Due to the stimulation of inflammation, localized pain, swelling and limitation of movement of hand joints can occur, which can cause swelling and morning stiffness of finger joints. 2. Rheumatoid arthritis: it is a chronic, systemic autoimmune disease with erosive, symmetrical polyarthritis as the main clinical manifestation. Due to the stimulation of inflammatory factors, patients can first have joint swelling and pain, morning stiffness and other manifestations, with the progress of the disease can gradually appear articular cartilage and bone destruction, which can lead to finger joint swelling and morning stiffness. 3. Tendonitis: it is an inflammation that occurs at the beginning of the tendon attached to the bone or muscle. Due to inflammatory stimulation, tendon and peritendon pain can occur, accompanied by mild swelling and impaired mobility, which can lead to morning stiffness of swollen finger joints. In addition, finger joint swelling and morning stiffness can also be seen in other diseases, such as systemic sclerosis and other diseases, it is recommended that patients go to the hospital in a timely manner, in accordance with the doctor’s instructions to standardize the diagnosis and treatment, to avoid delaying the condition.