What might cause nipple discharge if I'm not pregnant?

Reviewed by Yoshinori Abe, MD

Internal Medicine

Nipple discharge without pregnancy is a common symptom that can affect people of any age or gender. Possible causes include hormonal fluctuations, certain medications (such as antidepressants or birth control), thyroid imbalances, benign breast conditions, infections, or, less commonly, tumors. The color, consistency, and whether the discharge comes from one or both breasts can offer important clues about the underlying cause.

Because nipple discharge can stem from many different conditions—some harmless and some requiring prompt medical attention—it's important not to guess. Taking a free, instant, online symptom check can help you understand potential causes based on your specific situation and guide you on what steps to take next.

Reviewed for medical accuracy: 07/20/2026

Important Next Steps

Learn what could cause nipple discharge Discover if nipple discharge needs care Find out if it could be serious See OTC options for nipple discharge Find a doctor for nipple discharge Understand medically valid nipple discharge remedies Check if discharge needs urgent evaluation

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Explanation

Nipple discharge when you're not pregnant can be caused by several things. It is often due to hormonal changes in your body. For example, your body might be making too much of a hormone called prolactin.

Other causes can include:

Medications: Some medicines can make your body produce more prolactin, leading to discharge.
Breast Conditions: Conditions like infections or non-cancerous growths in the breast can also cause discharge.
Other Health Issues: Sometimes, problems with the thyroid or kidneys can be the reason.

Most of the time, nipple discharge is not a sign of something serious, but if you're experiencing this symptom, you can use a free symptom checker to help identify possible causes and determine if you need to see a doctor.

(References)

State D. (1991). Nipple discharge in women. Is it cause for concern?. Postgraduate medicine, 1994359.
Vavolizza RD, & Dengel LT. (2022). Management of Nipple Discharge. The Surgical clinics of North America, 36335926.
Bruehlman RD, Winters S, & McKittrick C. (2022). Galactorrhea: Rapid Evidence Review. American family physician, 36521467.

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