About the data: We used the family income data from the 2013 American Community Survey. This counts only families, which the government defines as households with two or more people related by birth, marriage or adoption. The graph focuses on families living in the country's 30 most populous cities.
Diseases and conditions that may cause edema include: 1  Congestive heart failure. 2  Cirrhosis. 3  Kidney disease.  Kidney 1  damage. Weakness or damage to veins in your legs.  Inadequate lymphatic 1  system. Symptoms.  Risk factors.
Swelling of the foot, ankle and leg can be severe enough to leave an indentation (pit) when you press on the area. This swelling (edema) is the result of excess fluid in your tissues â often caused by congestive heart failure or blockage in a leg vein. Signs of edema include: Swelling or puffiness of the tissue directly under your skin, especially in your legs or arms