The short explanation
Bloodstained discharge from one nipple that appears on its own should be checked by a doctor within a week or two. The most common cause is a small benign growth inside a milk duct, called an intraductal papilloma. Other benign causes include widened ducts and infection. Less often, bloody discharge can be a sign of breast cancer, which is why doctors always investigate it even when no lump can be felt. Discharge that comes from one breast, from a single duct opening, and without squeezing is the kind doctors look at most carefully.
What depends on your situation
The parts of this that change from woman to woman. Uncertainty is stated, not hidden.
- The doctor will examine both breasts and the armpits, and may gently press to see which duct the discharge comes from. A mammogram and an ultrasound focused behind the nipple are common next steps. A sample of the discharge may be tested, and sometimes a small operation to remove the affected duct is suggested to both diagnose and treat it.
- Note down the colour, which breast, how often it happens and whether it is linked to your cycle. Do not keep squeezing the nipple to check, as that can make discharge continue.
- A gynaecologist, general surgeon or breast clinic can see you.
What this answer cannot determine
The boundary of online education. These need a clinician who can see you.
- This cannot tell you the cause of the bleeding. Examination and imaging are needed, and sometimes a tissue sample.
Questions for your clinician
Take these with you. You can add any of them to an appointment card.
- Which duct is the discharge coming from?
- Do I need a mammogram, an ultrasound, or both?
- Should the discharge be tested?
- If a papilloma is found, does it need removing?
When to seek help
Clinician-approved guidance for this topic. When in doubt, being seen is never the wrong choice.
Book an appointment soon
- See a clinician within a week or two for bloody discharge from one nipple, sooner if you also find a lump or skin change.
Raise it at a routine appointment
- Keep a short note of each episode to take to your appointment. You can ask for a woman doctor for the examination, and you can bring someone you trust into the room with you.
Sources
The evidence this explanation is built on.
- Nipple discharge NHS
- Breast cancer — symptoms NHS
- Breast diseases MedlinePlus (NIH)
Who wrote and reviewed this
Every AskHer answer names its author. A clinically reviewed answer also names the clinician who signed it off — if no clinician is named below, it has not been clinically reviewed.
- Author
- AskHer Editorial (AI-assisted draft) AskHer's editorial team — not an individual clinician Works in English, தமிழ், हिन्दी
- Clinical reviewer
- Nobody yet No clinician has signed this answer off, and no person on the editorial team has read it yet. That is what the “Written with AI assistance” label means. It is queued for an editor to read, and then for a clinician who works in this area. The sources it was drafted against are listed above.
- Review status
- Written with AI assistance — not yet reviewed by a person
- Last reviewed
- Not yet reviewed by a person
- Version
- 1
Correction history
Substantive changes are listed, not quietly edited away.
No corrections have been made since this answer was first published.
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