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.
An abnormal buildup of fluid in tissues called edema is what causes swelling in the legs. In some cases, edema that results in painful swollen legs and ankles can be caused by lymphatic dysfunction. In other cases, edema can result from long-standing venous reflux, a venous disease that causes spider veins and varicose veins and can lead to more serious conditions, such as skin discoloration or venous ulcers.