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.
Edema in the leg is most commonly caused by: A blood clot. Any blockage, such as a clot in one of the veins can impede the flow of blood. This causes an increase in pressure in the vein, which may result in leakage of fluids into the surrounding tissue, causing edema.