Galactorrhea is a discharge of milk-like substance from the breast that is not associated with breastfeeding. This condition mainly occurs in women. It does occur in men and may even occur in infants, but much less commonly. The milky white discharge can come from 1 or both breasts, and the breast may leak fluid with or without stimulation.

The Breast

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Galactorrhea has many causes, though sometimes the cause is unknown. Excess prolactin, a hormone that stimulates milk production, is often the cause of galactorrhea. Tumors of the pituitary gland, called pituitary adenomas or prolactinomas, can cause excess prolactin production. The pituitary is a small gland attached to the brain. Pituitary tumors are usually not cancerous. They can cause galactorrhea when they produce excess prolactin, a hormone that stimulates milk production.

Other causes of galactorrhea include:

  • Some medications, such as:
    • Birth control pills or other hormones
    • Certain blood pressure drugs
    • Certain psychiatric medications
    • Anti-nausea drugs
    • Some antigastroesophageal reflux medications
    • Some pain killers
  • Certain herbs, such as :
    • Nettle
    • Fennel
    • Blessed thistle
    • Anise
    • Fenugreek seed
  • Illicit drugs, such as marijuana and opioids
  • Sexual stimulation of the breast
  • Certain diseases, such as underactive or overactive thyroid, and chronic kidney failure, or liver disease
  • Chronic emotional stress
  • Hypothalamic tumors or disease
  • Chest wall conditions, such as:
    • Shingles
    • Trauma
    • Burns
    • Surgical scars
    • Tumors of chest wall
  • In newborns, high levels of circulating maternal estrogen may result in enlarged breast tissue and secretion of milk

Risk Factors

Galactorrhea is more common in women. Other factors that may increase your chance of galactorrhea include:

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


The primary symptom is a milky discharge from the nipple that is not associated with breast-feeding. The discharge can come from 1 or both breasts. Other symptoms that can occur along with the discharge include:

  • Enlargement of the breast tissue
  • Abnormal or absent menstruation
  • Delayed puberty
  • Loss of sex drive
  • Impotence in men
  • Inability to conceive a child
  • Nausea or vomiting
  • Headaches
  • Acne or abnormal hair growth
  • Visual difficulties


You will be asked about your symptoms and medical history. A physical exam will be done. Tests may include:

  • A sample of the breast discharge to look at under a microscope
  • Blood tests to check hormone levels
  • Pregnancy test
  • Imaging tests to check for a pituitary gland tumor in the brain:

If the discharge is not milky or contains blood, then this is not galactorrhea. Other tests must be done to check for breast cancer or other disorders.


Treatment depends on the cause. In some cases, no medical treatment is necessary, and the condition will go away on its own. In these cases, breast binders that prevent stimulation of the nipples may be effective. If medications are identified as the potential cause, safe alternatives should be sought.

If an underlying cause for galactorrhea, such as a pituitary tumor, is found, this condition may be treated.


To reduce your chance of galactorrhea:

  • Avoid wearing clothing that irritates the breast.
  • Avoid frequent breast self-exam; usually once a month is enough.
  • Avoid excessive sexual stimulation of the breasts.
  • Do not use illicit drugs.