Nipple discharge can be unsettling, especially if you are not pregnant or breastfeeding. Finding a mark inside your bra or noticing fluid from your nipple often raises questions about whether something is wrong.
In many cases there is no serious cause. Hormonal changes, certain medications and conditions affecting the milk ducts can all lead to discharge. However, it should not be ignored, particularly if it is new or appears without you touching your breast.
What causes nipple discharge?
Nipple discharge is fluid that comes from one or both nipples. It can be white, yellow, green, brown, clear or blood-stained.
Common and less concerning causes include:
Hormonal changes – fluctuations in hormone levels or elevated prolactin can produce milky discharge outside pregnancy or breastfeeding.
Medication – some antidepressants and hormonal contraceptives may contribute.
Milk duct changes – duct ectasia (widening of a milk duct) can cause thick, sticky discharge that is green, yellow or brown.
Benign growths – small non-cancerous growths inside a duct, known as intraductal papillomas, can cause discharge.
Infection or inflammation of the breast tissue or ducts.
Small amounts of fluid may appear when the nipple is squeezed. Repeatedly checking can stimulate more fluid, so it is best to avoid this.
When should it be checked?
The way the discharge occurs is often more important than its colour.
Make an appointment with a doctor if the discharge:
Appears without squeezing or touching the nipple
Comes from only one breast
Is bloody or clear and watery
Keeps returning or persists
Appears together with a new lump or other breast changes
Discharge in men also needs medical assessment.
These symptoms do not automatically mean breast cancer. Many cases have a benign cause, but a healthcare professional can decide whether further tests are needed.
Does the colour matter?
Colour can offer clues but cannot confirm whether the discharge is harmless on its own.
Bloody or pink discharge should always be checked, especially if spontaneous or from one breast.
Clear or watery discharge that appears without pressure, particularly from one nipple, also warrants assessment.
White or milky discharge may relate to pregnancy, breastfeeding, hormones or medication. Unexplained cases should be discussed with a doctor.
Yellow, green or brown discharge can occur with non-cancerous duct changes, but colour alone is not enough to rule out a problem.
Other breast changes to watch for
Be aware of any new changes in how your breasts look or feel, including:
A new lump or thickened area in the breast or armpit
A nipple that turns inward or changes direction
Crusting, scaling or a persistent rash around the nipple
Dimpling, puckering, swelling or skin changes
A noticeable change in the size or shape of a breast
Most breast changes are not cancer, but new or persistent symptoms should be assessed rather than left to see if they disappear.
Don’t ignore a change
Breast awareness means knowing what is normal for you and noticing when something changes. Nipple discharge is often caused by non-cancerous conditions, but new, spontaneous, bloody or persistent discharge deserves medical attention.
If you notice an unexplained change, arrange an appointment with your GP or local clinic. Avoid repeatedly squeezing the nipple, and do not wait for a lump to appear before seeking advice.
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