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A problem that may arise after treatment for breast cancer is swelling of the arm on the side of the treatment. This condition, called lymphedema, is caused by the loss or damage of underarm lymph nodes and their connecting vessels. It occurs because circulation of lymph fluid is slowed in the arm, making it harder to fight infection. You should take special care of your arm to prevent infection.
Follow these simple rules:
Call your doctor at once if your arm becomes red, swollen, or feels hot. In the meantime, put your arm over your head and alternately squeeze and relax your fist.
Though you should be cautious, it's also important to use your arm normally-don't favor it or keep it dependent.