Swelling of fingers after waking up in the morning may be caused by rheumatoid arthritis, kidney disease, osteoarthritis and other reasons. 1. Rheumatoid arthritis: rheumatoid arthritis is a common symptom of morning stiffness, joint swelling and joint pain, which can lead to the symptoms of finger swelling after waking up in the morning. 2. Kidney disease: Diabetic nephropathy, nephritis, kidney tumor and other kidney diseases can lead to sodium and water retention in the patient’s body and cause edema, so the patient’s finger swelling after waking up in the morning may be caused by kidney disease. 3. Osteoarthritis: Osteoarthritis is a degenerative joint disease. It mostly involves the finger joints, knees, spine, hip and so on. It can cause patients to have symptoms of finger swelling, which can be relieved after activities, usually not more than 15-30 minutes, and only limited to the affected joints. There may be other reasons for the swelling of the fingers after waking up in the morning, and it is recommended that the patient go to the rheumatology and immunology department of the regular hospital for further clarification of the cause of the disease and standardized treatment according to the doctor’s instructions.