Common causes of sudden swelling of the fingertips include acute cardiac insufficiency, osteoarthritis, and trauma. Treatment should be decided according to the specific situation. 1. Acute cardiac insufficiency: acute cardiac insufficiency can cause water retention in the body, causing edema of the finger joints. 2. Osteoarthritis: caused by degenerative changes in articular cartilage, there may be enlargement of the knuckles, often accompanied by morning stiffness and pain. Non-steroidal anti-inflammatory drugs such as ibuprofen can be taken, or surgical treatment, deformity correction surgery. 3. Trauma: Trauma to the fingers leads to neurovascular damage, which can lead to enlarged knuckles. If any of the above symptoms occur, consult a doctor in time and follow the doctor’s instructions to standardize the treatment, so as not to delay the condition.