Although the discharge from the breast nipple is not important most of the time, it can be a sign of cancer, although it is rare. For this reason, the breast nipple discharge should be taken seriously and evaluated by a specialist physician. 

If the discharge coming from the breast nipple occurs spontaneously (that is, it does not come by squeezing), if it comes from a single breast nipple and if it is dark or bloody, it should be investigated further. 3% of women diagnosed with the breast cancer have discharge from the breast nipple. After imaging (Breast ultrasound, mammography and galactography-film of milk ducts-) in the breast nipple discharge, if necessary, smear should be performed for pathological examination. 

By means of massaging or squeezing, a milky or green-colored discharge from both breasts can also be encountered in normal situations. As the age progresses, the probability of discharge from the breast nipple increases. Women who have given birth more often have more breast nipple discharge. 

In the cystic breast structure, a gray-green discharge can come from more than one duct by squeezing. Milk-colored or green-colored discharges coming from multiple ducts in both breasts or in one breast are considered as benign symptoms.