Sometimes the cause is not known. Some causes are:
- 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
This content is reviewed regularly and is updated when new and relevant evidence is made available. This information is neither intended nor implied to be a substitute for professional medical advice. Always seek the advice of your physician or other qualified health provider prior to starting any new treatment or with questions regarding a medical condition.
Edits to original content made by Denver Health.
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a (Inappropriate Lactation)
American Congress of Obstetricians and Gynecologists http://www.acog.org
Family Doctor—American Academy of Family Physicians http://familydoctor.org
The College of Family Physicians of Canada http://www.cfpc.ca
Health Canada https://www.canada.ca
Galactorrhea. Family Doctor—American Academy of Family Physicians website. Available at: http://familydoctor.org/familydoctor/en/diseases-conditions/galactorrhea.html. Updated May 8, 2020. Accessed July 23, 2020.
Hyperprolactinemia. EBSCO DynaMed website. Available at: https://www.dynamed.com/condition/hyperprolactinemia . 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.