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Build-up of fluid in the body's tissues, often occurring in the lower leg and ankle, is called swelling or edema. Although painless, swelling may be caused by some medications, injury, vein problems, heart problems or other reasons. Prolonged swelling should not be ignored, as it may be a sign of serious disease or chronic venous insufficiency. Some symptoms of edema include enlarged ankes and calf (lower leg may appear puffy); discomfort or tired legs; decreased mobility (leg may feel heavy); and decreased skin elasticity.
The 15-20 mmHg moderate compression is most often used to treat mild swelling. Moderate to severe swelling typically requires a higher compression for proper treatment and alleviation of the condition.