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 and conditions that may cause edema include: 1  Congestive heart failure. 2  When one or both of your heart's lower chambers lose their ability to pump blood effectively â as happens in congestive heart failure â the blood can back up in your legs, ankles and feet, causing edema.