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Nipple Discharge

Typical recovery: Clinical evaluation and breast imaging require no recovery period. Image-guided core biopsy usually causes only mild bruising or soreness for a few days. If surgical duct excision is required, it is commonly performed as day-care or short-stay surgery; routine activity usually resumes over several days, while wound healing generally progresses over one to two weeks.

Key points

  • Most nipple discharge is caused by benign conditions.
  • The pattern of discharge is more informative than colour alone.
  • Physiological discharge is usually bilateral, multiduct and appears only with squeezing or manipulation.
  • Pathological discharge is more likely to be spontaneous, unilateral or arise from a single duct.
  • Clear, serous and blood-stained spontaneous single-duct discharge deserves careful assessment.
  • Green, yellow or dark multiduct discharge is commonly associated with benign duct ectasia.
  • Intraductal papilloma is one of the most common benign causes of pathological nipple discharge.
  • A breast lump, nipple distortion, skin change or abnormal lymph node occurring with discharge increases concern and requires complete breast assessment.
  • Pathological nipple discharge in a man requires prompt breast assessment because the association with underlying malignancy is considerably greater than in women.
  • Clearly physiological discharge does not routinely require breast imaging according to current ACR guidance.
  • For pathological discharge in women younger than 30 years, ultrasound is generally the most appropriate first imaging test.
  • For pathological discharge in women aged 30 years and above, diagnostic mammography or tomosynthesis together with ultrasound is generally appropriate.
  • Normal imaging substantially lowers the likelihood of an underlying malignancy but does not automatically end assessment when persistent high-risk discharge continues.
  • MRI is not a routine first-line test for nipple discharge but may be useful in selected patients with persistent clinical concern and unrevealing conventional imaging.
  • Nipple-discharge cytology has limited diagnostic accuracy and is not routinely recommended as a substitute for imaging and tissue diagnosis.
  • If imaging identifies a lesion, image-guided core biopsy is generally preferred to attempting to diagnose the cause from the discharge fluid itself.
  • Milky bilateral discharge outside pregnancy and lactation may be caused by medication, hyperprolactinaemia or hypothyroidism rather than a breast lesion.
  • Repeated squeezing to check whether discharge is still present can perpetuate physiological discharge and should be discouraged.
  • Bloody discharge during pregnancy or very early lactation can occasionally be physiological, but persistent, unilateral or otherwise suspicious discharge requires assessment.
  • Surgery is not required for every patient with nipple discharge; treatment is directed toward the underlying diagnosis and persistence or severity of symptoms.

Overview

Nipple discharge is common and is usually caused by a benign condition, but the pattern of discharge determines how carefully it needs to be investigated. Physiological discharge is typically bilateral, arises from several ducts, occurs only when the nipple is squeezed and is often white, yellow, green or milky. Pathological nipple discharge is more concerning when it occurs spontaneously, comes from one breast or a single duct, and is clear, serous or blood-stained. Common benign causes include intraductal papilloma, duct ectasia, pregnancy or lactation, hormonal causes and medication-related galactorrhoea. Breast cancer is a less common but important cause, particularly when discharge is spontaneous, unilateral, bloody, associated with a breast lump, nipple or skin change, abnormal imaging, increasing age or male sex. Evaluation begins with a detailed history and breast examination. Imaging is selected according to age and clinical features. Clearly physiological discharge may not require breast imaging. Pathological discharge requires age-appropriate diagnostic imaging, usually ultrasound in younger women and diagnostic mammography or tomosynthesis together with ultrasound in women aged 30 years and above. If imaging identifies a suspicious lesion, image-guided core biopsy is performed. Persistent high-risk discharge with normal initial imaging may require further breast-specialist assessment, selected use of breast MRI or surgical duct excision. Management depends on the underlying cause rather than on the colour of discharge alone.

Signs & symptoms

  • Spontaneous fluid leaking from one or both nipples.
  • Discharge noticed on clothing without squeezing the nipple.
  • Clear, watery or serous discharge.
  • Blood-stained or frankly bloody discharge.
  • Milky discharge unrelated to normal breastfeeding.
  • Green, yellow, brown or dark discharge, commonly associated with benign duct ectasia.
  • Discharge from a single visible duct opening.
  • Discharge from several duct openings.
  • An associated breast lump.
  • Nipple inversion, distortion, ulceration or eczema-like change.
  • Breast pain, redness or inflammation when infection or periductal mastitis is present.

How assessment and treatment are planned

  1. 1

    Establish whether the discharge is spontaneous or appears only when the nipple is squeezed.

  2. 2

    Determine whether the discharge is unilateral or bilateral and whether it originates from one duct or several ducts.

  3. 3

    Record the colour, frequency, duration and approximate amount of discharge.

  4. 4

    Ask about associated breast lumps, breast pain, recent nipple inversion, skin change or inflammation.

  5. 5

    Review pregnancy and breastfeeding status.

  6. 6

    Review medicines that can cause galactorrhoea, including some antipsychotics, antidepressants and other prolactin-raising drugs.

  7. 7

    Perform examination of both breasts, nipples and regional lymph nodes.

  8. 8

    When possible, identify whether the discharge is coming from a single duct.

  9. 9

    For clearly physiological bilateral multiduct discharge without suspicious findings, reassurance and correction of repeated nipple stimulation may be sufficient.

  10. 10

    For pathological nipple discharge, arrange age-appropriate diagnostic breast imaging.

  11. 11

    In women younger than 30 years, targeted ultrasound is usually the initial imaging test.

  12. 12

    In women aged 30 years or older with pathological discharge, diagnostic mammography or tomosynthesis together with ultrasound is generally appropriate.

  13. 13

    If imaging identifies a suspicious lesion, perform image-guided tissue biopsy according to the imaging findings.

  14. 14

    For persistent milky bilateral discharge outside pregnancy or breastfeeding, consider assessment for galactorrhoea including medication review and appropriate endocrine testing such as serum prolactin and thyroid function.

  15. 15

    If clinically concerning discharge persists despite negative standard imaging, refer for specialist breast assessment and consider further imaging such as contrast-enhanced MRI in selected cases.

  16. 16

    Consider microdochectomy or another form of duct excision when persistent troublesome or high-risk single-duct discharge remains unexplained or when tissue diagnosis is required.

Preparation

  • Note whether the discharge occurs spontaneously or only when you squeeze the nipple.
  • Observe whether it comes from one breast or both breasts.
  • If possible, note whether the discharge seems to arise from one duct opening or several.
  • Record the colour and approximate frequency of the discharge.
  • Avoid repeatedly squeezing the nipple before your appointment simply to check whether discharge is still present.
  • Bring previous mammograms, breast ultrasound, MRI or biopsy reports if available.
  • Tell the clinician about pregnancy or breastfeeding.
  • Bring a complete medication list, including psychiatric medicines and hormonal treatments.
  • Mention previous breast surgery, breast biopsy or nipple procedures.
  • Tell the clinician about a family history of breast or ovarian cancer.
  • Report any associated lump, recent nipple inversion, skin change, breast pain or inflammation.

Recovery and aftercare

  • Follow the imaging or biopsy recommendations provided after clinical assessment.
  • If the discharge has been classified as physiological, avoid repeated nipple squeezing because continued stimulation can perpetuate discharge.
  • Return for reassessment if previously benign discharge becomes spontaneous, unilateral, bloody or associated with a new lump.
  • If a medication is suspected as the cause of galactorrhoea, do not stop prescribed medication without discussing it with the prescribing clinician.
  • Attend endocrine evaluation when persistent milky discharge is associated with abnormal prolactin, thyroid dysfunction or other hormonal symptoms.
  • After core biopsy, follow the wound and dressing instructions provided by the breast-imaging team.
  • If imaging and biopsy are benign but spontaneous single-duct discharge persists, attend the planned breast-surgical review rather than assuming that no further assessment is required.
  • After duct excision, attend postoperative review for final histopathology even when preoperative imaging was reassuring.

Risks and possible complications

  • An underlying breast lesion may be missed if pathological discharge is repeatedly dismissed as physiological.
  • Repeated nipple manipulation can perpetuate otherwise benign discharge.
  • An intraductal papilloma or another small ductal lesion may not always be palpable clinically.
  • Conventional breast imaging can occasionally be negative despite an underlying small intraductal lesion.
  • Unnecessary surgery can cause scarring, altered nipple sensation and difficulty breastfeeding, which is why duct excision is used selectively.
  • Duct excision can cause bleeding, infection, nipple numbness, nipple retraction or alteration in nipple sensation.
  • Major duct excision may reduce or prevent future breastfeeding from the operated breast.
  • Persistent galactorrhoea may remain untreated if medication or endocrine causes are not recognised.
  • Breast malignancy is uncommon overall but becomes more important when discharge is spontaneous, unilateral, bloody, associated with a lump or occurs in higher-risk patients.

When to arrange prompt medical assessment

  • Spontaneous discharge from one nipple that occurs without squeezing.
  • Blood-stained or frankly bloody nipple discharge.
  • Clear or watery discharge repeatedly arising from a single duct.
  • Nipple discharge associated with a breast lump.
  • New nipple inversion, distortion, ulceration or persistent eczema-like change.
  • Persistent discharge in a postmenopausal woman.
  • Any unexplained nipple discharge in a man.
  • Persistent unilateral discharge during pregnancy or breastfeeding, particularly if blood-stained.
  • Milky discharge unrelated to pregnancy or breastfeeding, especially if associated with menstrual disturbance, headache or visual symptoms.

When to go to an emergency department now

  • Nipple discharge associated with rapidly spreading breast redness, high fever or systemic illness.
  • Severe breast infection with rapidly increasing swelling or signs of sepsis.

Myth vs fact

Frequently asked questions

Sources

Medically reviewed by Dr. Shams Alam Mohammed Tahir, MBBS, MS (General Surgery). Last reviewed 2026-09-18.

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