Swelling of the fingers after waking up in the morning may be caused by gout, or by rheumatoid arthritis, tenosynovitis and other factors. 1. Gout: If the level of uric acid in the blood is elevated, it may lead to the deposition of urate crystals in the joints of the fingers, resulting in the symptoms of swelling and pain in the joints after waking up in the morning. 2. Rheumatoid arthritis: characterized by chronic polyarthritis, clinical manifestations include joint swelling, pain, morning stiffness, etc. It usually occurs in the joints of the fingers, wrists, toes, ankles and knees. 3. Tenosynovitis: It is mainly a chronic, sterile inflammation caused by mechanical friction, mostly occurring in the finger and wrist joints, with symptoms such as joint pain, swelling and stiffness. Swelling of the fingers in the morning should be noted, it is recommended to go to the hospital as soon as possible for relevant examinations, after a clear diagnosis under the guidance of the doctor standardized treatment.