Reality: A lump may indicate breast cancer (or one of many benign breast conditions), but women should also be on the alert for other kinds of changes that may be signs of cancer. These include swelling; skin irritation or dimpling; breast or nipple pain; nipple retraction (turning inward); redness, scaliness, or thickening of the nipple or breast skin; or a discharge other than breast milk.
Breast cancer can also spread to underarm lymph nodes and cause swelling there before a tumor in the breast is large enough to be felt. On the other hand, a mammogram may pick up breast cancer that has no outward symptoms at all.
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