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.
Swelling of the foot, ankle and leg can be severe enough to leave an indentation, or pit, when you press on the area. This swelling (edema) is the result of excess fluid in your tissues â often caused by congestive heart failure or blockage in a leg vein.