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.
1 Edema is a swelling, usually of the legs, due to the accumulation of excessive fluid in the tissues. 2  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.dema most commonly occurs in the feet and legs, where it is referred to as peripheral edema. The swelling is the result of the accumulation of excess fluid under the skin in the spaces within the tissues. All tissues of the body are made up of cells and connective tissues that hold the cells together.