Frequent swelling of the hands may be due to the following reasons: 1. It may be caused by old injuries. If there are old fractures, dislocations or serious soft tissue injuries around the hands, the hands may remain swollen for a long time after recovery.2. There may be skin-related lesions on the hands, such as contact dermatitis or frostbite on the hands, which may lead to recurring swelling of the hands.3. There may be circulatory lesions due to a series of factors leading to obstruction of venous or lymphatic system of the upper limbs, which may lead to poor reflux and subsequent swelling of the hands. 3, there may be circulatory system related lesions, due to a series of factors lead to the upper limbs of the venous or lymphatic system is blocked, will lead to poor reflux, and then appeared in the swelling of the hand. 4, there may be malnutrition. Severe malnutrition can lead to a rapid decline in albumin levels, which may result in swelling of the extremities.5. There may be kidney-related diseases, such as nephritis or renal failure, etc. In this case, the body will produce large amounts of protein, which may lead to swelling of the hands. At this time will produce a large amount of fluid accumulation in the body, the hand is also a frequent swelling of the part. 6, the more rare case is the emergence of shoulder-hand syndrome, a kind of complication.