Breast Milk Outside Pregnancy or in a Man
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Reviewed By:

Yoshinori Abe

Yoshinori Abe, MD (Internal medicine)

Dr. Abe graduated from The University of Tokyo School of Medicine in 2015. He completed his residency at the Tokyo Metropolitan Health and Longevity Medical Center. He co-founded Ubie, Inc. in May 2017, where he currently serves as CEO & product owner at Ubie. Since December 2019, he has been a member of the Special Committee for Activation of Research in Emergency AI of the Japanese Association for Acute Medicine. | | Dr. Abe has been elected in the 2020 Forbes 30 Under 30 Asia Healthcare & Science category.

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Content updated on Jan 4, 2023

About the symptom

Lactation is the secretion and yielding of milk through the mammary glands, which are located in the breasts.

When to see a doctor

Seek professional care if you experience any of the following symptoms

  • Breast milk outside pregnancy or as a man

Possible causes

  • Hyperprolactinemia

    Excessively high prolactin (hormone that releases milk) levels in the blood. Causes include medications and brain tumors.

  • Acromegaly

    A condition caused by abnormally high levels of growth hormone in the blood. It is typically caused by benign (non-cancerous) tumors in the brain.

  • Pituitary adenoma

    Pituitary adenoma is a non-cancerous growth from the pituitary gland (a small, hormone-producing gland in the brain). These are usually slow-growing and don't initially cause symptoms. However, they can grow large enough to press on nearby structures, causing symptoms.

  • Mastopathy
  • Hypopituitarism
  • Neuromyelitis Optica (NMO)

Questions your doctor may ask about this symptom

Your doctor may ask these questions to check for this symptom

  • Are you producing breast milk inappropriately (even though you have not been pregnant or given birth, or are a man)?

Other Related Symptoms

Similar symptoms or complaints

Reviewed By:

Yoshinori Abe

Yoshinori Abe, MD (Internal medicine)

Dr. Abe graduated from The University of Tokyo School of Medicine in 2015. He completed his residency at the Tokyo Metropolitan Health and Longevity Medical Center. He co-founded Ubie, Inc. in May 2017, where he currently serves as CEO & product owner at Ubie. Since December 2019, he has been a member of the Special Committee for Activation of Research in Emergency AI of the Japanese Association for Acute Medicine. | | Dr. Abe has been elected in the 2020 Forbes 30 Under 30 Asia Healthcare & Science category.

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