Lymphedema: Lymphedema is the swelling of one or more of the legs and arms caused by poor function of the lymphatic system. There are two classifications of lymphedema, primary and secondary. The most common cause of secondary lymphedema in the US is breast cancer treatment complications as well as other surgeries. Filariasis is the most common cause of lymphedema worldwide. There is no cure for lymphedema (with the exception of antibiotics for filariasis). Focus is geared toward the management of symptoms.