Primary lymphedema is a rare condition that is caused by lymph vessel abnormalities present at birth. Secondary lymphedema is acquired and is the result of something that causes an interruption in the lymphatic system. These causes include surgery, trauma, or cancer. Treatments for lymphedema may include compression garments, exercise, and more. Follow the links below to find WebMD's comprehensive coverage about how lymphedema is contracted, what it looks like, how to treat it, and much more.