If you are having fluid that comes from your nipple and stains sheets or underwear, some of the fluid may be collected and looked at under a microscope to see if any cancer cells are in it.
Most nipple discharges or secretions are not cancer. In most cases, if the fluid looks clear, green, or milky, cancer is very unlikely. If the discharge is red or red-brown, suggesting that it contains blood, it might be caused by cancer. But it is more likely caused by an injury, infection, or benign tumor.
Even when no cancer cells are found in a nipple discharge, it is not possible to say for certain that a breast cancer is not there. If there is a suspicious mass, a biopsy is needed, even if the nipple discharge does not contain cancer cells.
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