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(Inappropriate Lactation)

How to Say It: gah-LAK-tor-ree-ah


Galactorrhea is a milk-like discharge from one or both breasts. It is not from breastfeeding. The breast may leak fluid with or without being touched.

The Breast
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Sometimes the cause is not known. Some causes are:

  • Pregnancy
  • Stimulation of the breast from things like breast exams and clothing that rubs against them
  • Certain medicines, such as antidepressants, blood pressure medicines, sedatives, and medicines that contain hormones
  • Certain herbs, such as nettle, fennel, blessed thistle, anise, and fenugreek seed
  • Drugs, such as marijuana and opioids
  • Some health problems, such as underactive or overactive thyroid, chronic kidney failure, tumors, or liver disease
  • Injury to the chest or spinal cord

Risk Factors

This problem is more common in women. It can happen in men and infants, but it is not as common. Other things that may raise the risk are:

  • Prior pregnancy
  • Stress
  • Wearing clothing that irritates the nipple
  • Frequent breast self-exam or frequent breast stimulation


The main symptom is a milky discharge from 1 or both breasts that is not due to breastfeeding. Other problems may be:

  • Enlarged breasts
  • Abnormal or absent menstruation
  • Headaches
  • Vision problems
  • Loss of sex drive
  • An increase in hair growth on the chin or chest
  • Erectile problems in men


You will be asked about your symptoms and health history. A physical exam will be done.

Blood tests will be done to check hormone levels.

Images will be taken to look for signs of a tumor. This can be done with:


Some people will not need treatment. The problem will go away in time. Others will be treated based on the cause. This may mean changing medicines or have surgery to remove a tumor.


This problem may be prevented by avoiding:

  • Clothing that irritates the breasts
  • Stimulating the breasts and nipples
  • Conducting breast exams more than once a month

American Congress of Obstetricians and Gynecologists

Family Doctor—American Academy of Family Physicians


The College of Family Physicians of Canada

Health Canada


Galactorrhea. Family Doctor—American Academy of Family Physicians website. Available at: Updated May 8, 2020. Accessed July 23, 2020.

Hyperprolactinemia. EBSCO DynaMed website. Available at: Updated November 8, 2017. Accessed July 23, 2020.

Vilar L, Fleseriu M, et al. Challenges and pitfalls in the diagnosis of hyperprolactinemia. Arq Bras Endocrinol Metabol. 2014 Feb;58(1):9-22.

Last reviewed March 2020 by EBSCO Medical Review Board Elliot M. Levine, MD, FACOG  Last Updated: 3/12/2021