There are may different breast problems, including:
Nipple discharge is usually caused by benign disease (i.e. not breast cancer). Normal nipple discharge occurs during pregnancy and breastfeeding and may continue until up to one year after childbirth or the end of breastfeeding. Excessive breast stimulation can also cause nipple discharge.
This is a companion discussion topic for the original article at https://patient.info/womens-health/breast-problems