When you are not breast-feeding, fluid leaking from one or both
nipples is called nipple discharge. It may or may not be a sign of a medical
problem:
Non-spontaneous discharge that occurs only
when you press on your nipple is usually normal and occurs in the majority of
women at one time or another. The discharge can be clear, cloudy, white,
yellow, green, or brown. The more the nipple is pressed or stimulated, the more
fluid is discharged. This type of nipple discharge does not usually indicate a
problem.
Spontaneous discharge of fluid or blood from a
nipple is a concern, except during pregnancy and breast-feeding. This type of
discharge occurs without pressing or stimulating the nipple. Galactorrhea is
one type of spontaneous nipple discharge and may be a side effect of a
medication or caused by a non-cancerous tumour in the
pituitary gland (pituitary adenoma), decreased thyroid
function (hypothyroidism), or certain types of cancer.
Call your doctor if you have spontaneous nipple discharge or a
discharge from only one nipple (unilateral) or that looks like blood.