Galactorrhea is a discharge of milk-like substance from the
breast that is not associated with breastfeeding after
pregnancy. This condition mainly occurs in women. It does occur
in men, but much less commonly. The milky white discharge can
come from one or both breasts, and the breast may leak fluid
with or without stimulation. Galactorrhea has many causes,
though sometimes the cause is unknown. Tumors of the pituitary
gland, called pituitary adenomas or prolactinomas, can cause
galactorrhea. The pituitary is a small gland attached to the
brain. Pituitary tumors are usually not cancerous. They can
cause galactorrhea when they produce excess prolactin, a hormone
that stimulates milk production. Other causes of galactorrhea
include: - Hormonal imbalance, such as hypothyroidism Some
medicines, such as: - Stopping or starting to take birth control
pills or other hormones - Blood pressure drugs - Tricyclic
antidepressants - Antinausea drugs - Some antigastroesophageal
reflux medicines - Some pain killers - Certai