Swelling at the root of fingers may be caused by hand trauma, rheumatoid arthritis, gout, cardiac and renal insufficiency. 1. Hand trauma: patients with a clear history of trauma can be due to subcutaneous tissue damage, local bruising and other reasons leading to swelling at the root of the fingers. 2. Rheumatoid arthritis: when rheumatoid arthritis involves the finger joints, it can also lead to finger joint swelling and pain. 3. Gout: Gout is related to uric acid metabolism disorder, when the disease involves the finger joints, the patient will experience severe joint swelling and joint pain symptoms. 4. Cardiac and renal insufficiency: patients with cardiac and renal insufficiency will have abnormal venous return, which leads to sodium retention in the body, and this will also lead to swelling symptoms, including the fingers, including the limbs will also appear. There may be other reasons for swelling at the root of the fingers, and it is recommended that patients with this symptom go to the relevant departments of regular hospitals for further diagnosis.