The swelling of one hand is considered to be caused by the lack of blood circulation. Pay attention to whether the swollen hand is often kept in a certain position for too long, which results in poor blood circulation. In this case, you need to let your arm relax and move it first. After resting, the swelling of your arm will be much better and there is no need to worry about it. If the hand swelling is caused by poor body metabolism, you need to adjust the body, accelerate the body metabolism, eat less heavy food, if necessary, you can regulate through drugs, pay more attention to rest, maintain good habits, avoid staying up late, appropriate limb exercise such as playing badminton, swimming, gymnastics, etc., not only can exercise the body, but also can relax the mood.