Definition

• Milky nipple discharge

• Physiologic: pregnancy, postpartum
• Idiopathic (normal prolactin level in parous woman)
• Hyperprolactinemia, eg, medications, prolactinoma, hypothyroidism
• Benign or malignant neoplasm
• Nipple stimulation
• Mastitis
• Oral contraceptives or estrogen replacement therapy

• Nipple discharge
• Hyperprolactinemia