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.
Diseases that can cause edema. Several diseases are associated with the development of swelling of the legs and feet and may also cause edema of the hands and around the eyes. Kidney diseases may decrease the ability of the kidneys to remove salt and water from the body. Some kidney diseases cause loss of a protein called albumin in the urine.