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.
Causes of Edema. There can be a variety of causes of leg edema. Swelling can be due to a number of factors such as: Venous Insufficiency: Venous insufficiency is one of the most common causes of leg edema. It is a disorder caused when the veins in the legs are unable to effectively move blood back to the heart.