Nipple discharge is a normal part of breast function during pregnancy or breast-feeding. It also may be associated with menstrual hormone changes and fibrocystic changes. The milky discharge after breast-feeding will normally affect both breasts and can continue for up to two or three years after stopping nursing.
A papilloma is a noncancerous (benign) tumor that can be associated with bloody discharge. It appears spontaneously and involves a single duct. Although the bloody discharge may resolve on its own, this situation requires evaluation with an ultrasound of the area behind the nipple and areola. If the ultrasound shows a lesion within a milk duct, you may need a biopsy to confirm that it's a papilloma or to exclude a cancer.
Often, nipple discharge stems from a benign condition. However, breast cancer is a possibility, especially if:
- You have a lump in your breast
- Only one breast is affected
- The discharge contains blood
- The discharge is spontaneous and persistent
- The discharge affects only a single duct
Possible causes of nipple discharge include:
- Abscess
- Birth control pills
- Breast cancer
- Ductal carcinoma in situ (DCIS)
- Endocrine disorders
- Excessive breast stimulation
- Fibrocystic breasts (lumpy or rope-like breast tissue)
- Galactorrhea
- Injury or trauma to the breast
- Intraductal papilloma (a benign, wartlike growth in a milk duct)
- Mammary duct ectasia
- Mastitis (an infection in breast tissue that most commonly affects women who are breast-feeding)
- Medication use
- Menstrual cycle hormone changes
- Paget's disease of the breast
- Periductal mastitis
- Pregnancy and breast-feeding
- Prolactinoma
Causes shown here are commonly associated with this symptom. Work with your doctor or other health care professional for an accurate diagnosis.
Jan. 11, 2018
- Non-cancerous breast conditions. American Cancer Society. http://www.cancer.org/healthy/findcancerearly/womenshealth/non-cancerousbreastconditions/index. Accessed Oct. 20, 2016.
- Golshan M. Nipple discharge. http://www.uptodate.com/home. Accessed Oct. 20, 2016.
- Nipple discharge. Merck Manual Professional Version. http://www.merckmanuals.com/professional/gynecology-and-obstetrics/breast-disorders/nipple-discharge. Accessed Oct. 20, 2016.
- American College of Obstetricians and Gynecologists (ACOG) Committee on Practice Bulletins — Gynecology. ACOG Practice Bulletin No. 164: Diagnosis and Management of Benign Breast Disorders. Obstetrics & Gynecology. 2016;127:e141.
- AskMayoExpert. Nipple discharge. Rochester, Minn.: Mayo Foundation for Medical Education and Research; 2016.
- Galactorrhea. Merck Manual Professional Version. http://www.merckmanuals.com/professional/endocrine-and-metabolic-disorders/pituitary-disorders/galactorrhea#v980911. Accessed Oct. 25, 2016.
- Understanding breast changes: A health guide for women. National Cancer Institute. https://www.cancer.gov/publications/patient-education/understanding-breast-changes. Accessed Oct. 25, 2016.
- Paget disease of the breast. National Cancer Institute. https://www.cancer.gov/types/breast/paget-breast-fact-sheet. Accessed Oct. 25, 2016.
- Dixon JM. Nonlactational mastitis. http://www.uptodate.com/home. Accessed Oct. 31, 2016.
- Pruthi S (expert opinion). Mayo Clinic, Rochester, Minn. Oct. 28, 2016.
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