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Leg Swelling: Symptom of Pitting Edema. Leg swelling generally occurs because of an abnormal accumulation of fluid in the tissues of the lower extremity. Persisting indentation of a swollen leg after pressure from a finger is known as pitting edema. Common causes of leg swelling include. salt retention, cellulitis, congestive heart failure, and.
Diseases and conditions that may cause edema include: 1  Congestive heart failure. 2  When one or both of your heart's lower chambers lose their ability to pump blood effectively â as happens in congestive heart failure â the blood can back up in your legs, ankles and feet, causing edema. In nephrotic syndrome, declining levels of protein (albumin) in your blood can lead to fluid accumulation and edema. 2  Weakness or damage to veins in your legs. 3  Chronic venous insufficiency, in which the one-way valves in your leg veins are weakened or damaged, allows blood to pool in the leg veins and cause swelling.