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A problem that may arise after treatment is swelling of the arm on the side of the mastectomy. Called lymphedema, this condition is caused by the loss of underarm lymph nodes and their connecting vessels. Because the lymph nodes have been removed, circulation of lymph fluid is slowed, making it harder for your body to fight infection. You should take special care of your arm to prevent infection. (If you have had breasts removed, ask your doctor about any special precautions.)
Follow these simple rules:
Call your doctor at once if your arm becomes red, swollen, or feels hot. In the meantime, try to keep your arm over your head and periodically pump your fist.
Though you should be cautious, it's also important to use your arm normally-don't favor it or keep it dependent.