Nipple discharge is a common complaint in women who are not pregnant or breastfeeding, especially during the reproductive years. Nipple discharge is not necessarily abnormal, even among postmenopausal women, although it is always abnormal in men. Spontaneous unilateral nipple discharge, regardless of color, is considered abnormal. Nipple discharge can be serous (yellow), mucinous (clear and watery), milky, sanguineous (bloody), purulent, ...
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