If a sudden swelling of the finger joints occurs, you should consider whether the finger joints have been overworked. If you have been repeatedly moving your fingers for a long time, or if you have been working with your fingers a lot, it is likely that the finger joints have been stimulated by overwork, resulting in a slight exudation of the finger joints, leading to a sudden swelling. In addition to local swelling, this condition is usually accompanied by pain and soreness in the fingers. The sudden swelling of the fingers caused by excessive activity and labor is usually relieved by rest within 3-5 days. In some cases, the sudden cold stimulation of the finger joints may cause a transient inflammation and exudation of the soft tissues around the joints, including the synovial tendon sheaths, which may also lead to sudden swelling of the fingers.