If you're in the middle of the middle, however â not lower or upper-middle class â that would be an income range between $39,764 and $64,582, says Aaron Pacitti, an assistant professor of economics at Siena College in Loudonville, N.Y. Again, it isn't official.
Edema definition and facts. Edema is a swelling, usually of the legs, feet, and/or hands due to the accumulation of excessive fluid in the tissues. The edema that occurs in diseases of the heart, liver, and kidneys is mainly caused by salt retention, which holds the excess fluid in the body.
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.