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.
While edema in legs can be caused by lymphatic dysfunction or even a blood clot, painful swollen legs and ankles can also be caused by the progressive stages of venous disease. In these cases, venous reflux forces fluids to collect and pool in the tissues around the ankle and lower legs, causing the tissues to swell.