This is when one or more of your lymph nodes -- small glands that are part of your immune system -- are damaged or removed, as often happens during cancer treatment. As a result, your body gets rid of less fluid, and that can lead to swelling in your arms, legs, and feet. It can also result from damage to lymphatic vessels or other abnormalities in the lymphatic system. One treatment for this is called pneumatic compression. You wear a sleeve over the affected areas, and air is pumped into it every so often to put pressure there and help move fluid away. Exercises, massage, and compression sleeves or socks may help, too.