Swellings in the hands, feet, and legs are a result of water retention, or otherwise known as edema. Edema is manifested by the buildup of fluids in the tissues, circulatory system, and cavities.
Swellings often occur during a long flight as well. Edema is most often not serious, but at times, it can indicate a kidney disease or heart failure. Due to this, you should always find a way to treat edema.
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