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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.
This accumulation of fluid in the lung is called pulmonary edema. At the same time, accumulation of fluid in the legs causes pitting edema. This edema occurs because the build-up of blood in the veins of the legs causes leakage of fluid from the legs' capillaries (tiny blood vessels) into the interstitial spaces. An understanding of how the heart and lungs interact will help you better comprehend how fluid retention works in heart failure.