Nipple discharge in healthy breasts is common and usually not cause for concern. Several characteristics distinguish discharged caused by cancer (pathological) from normal discharge. The latter most often occurs in both breasts, while pathological discharge typically occurs only in the affected nipple. Normal discharge is yellow, green, or milky, while cancerous discharge is more likely to be brown or clear. Discharge containing blood is particularly suspicious. Pathological discharge appears early in breast cancer, though rarely in the absence of other symptoms.

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