Lymphedema arises when a transparent liquid called lymphatic-fluid accumulates in the soft tissues of the body, generally in the arms or legs. The lymphatic system includes lymph-vessels and lymph-nodes that stream through the body. Lymph vessels transmit this fluid consisting of wastes, fats, water, and protein from the cells of the body. Lymph-vessels transfer this fluid to the lymph nodes, and in turn, filter the waste materials and return the fluid to the blood. If the vessels or nodes are injured or missing, the lymph-fluid cannot travel liberally throughout the system. The fluids can accumulate and produce swelling. This swelling is known as lymphedema.