Doctors Note Logo

Published on: 7/15/2026

What are the possible causes of nipple discharge, and is it always a sign of a problem?

Nipple discharge is fluid leaking from one or both nipples. It can be clear, milky, yellow, green, brown, or bloody. Common causes include hormonal changes, pregnancy, breastfeeding, certain medications, infections, benign breast conditions, or, less commonly, breast cancer. While nipple discharge is often harmless, it should always be evaluated by a healthcare provider to rule out serious conditions.

Not sure if your symptoms warrant a doctor's visit? Take a free, instant symptom check to better understand possible causes and get clear guidance on your next steps—no signup required, and it takes just a few minutes.

Reviewed for medical accuracy: 07/15/2026

answer background

Explanation

Nipple discharge can happen for different reasons, and not all of them are serious. It can be caused by hormonal changes, infections, or even certain medications. Sometimes, it might just be a normal body change. But, it is important to be careful, because in some cases, it can be a sign of a more serious issue, like a growth or cancer.

Here are some common causes of nipple discharge:

  1. Hormonal Changes: Hormones in your body can cause discharge, especially if you are pregnant or breastfeeding.
  2. Infections or Inflammation: Sometimes, an infection or inflammation in the breast can cause discharge.
  3. Medications: Certain medications might cause nipple discharge as a side effect.
  4. Growths or Tumors: In rare cases, a growth or tumor in the breast might cause discharge.

If you notice nipple discharge, it is a good idea to talk to a doctor. You can start by using a free symptom checker to better understand your symptoms and whether you should seek medical care. They can help figure out what is causing it and if there is anything to worry about. Remember, it is always better to be safe and have it checked.

(References)

  • Leis HP Jr. (1989). Management of nipple discharge. World journal of surgery, 2696228.

  • Hussain AN, Policarpio C, & Vincent MT. (2006). Evaluating nipple discharge. Obstetrical & gynecological survey, 16551379.

  • Zervoudis S, Iatrakis G, Economides P, Polyzos D, & Navrozoglou I. (2010). Nipple discharge screening. Women's health (London, England), 20050819.

Thinking about asking ChatGPT?Ask me instead

Tell your friends about us.

We would love to help them too.

smily Shiba-inu looking

For First Time Users

What is Ubie’s Doctor’s Note?

We provide a database of explanations from real doctors on a range of medical topics. Get started by exploring our library of questions and topics you want to learn more about.

Was this page helpful?

Purpose and positioning of servicesUbie Doctor's Note is a service for informational purposes. The provision of information by physicians, medical professionals, etc. is not a medical treatment. If medical treatment is required, please consult your doctor or medical institution. We strive to provide reliable and accurate information, but we do not guarantee the completeness of the content. If you find any errors in the information, please contact us.