Breast lumps can be caused by:

  1. Breast cancer
  2. Breast cysts (a fluid-filled sac in your breast that's usually benign)
  3. Fibroadenoma (a solid, benign mass most common in young women)
  4. Fibrocystic breasts (lumpy or rope-like breast tissue)
  5. Injury or trauma to the breast
  6. Intraductal papilloma (a benign, wartlike growth in a milk duct)
  7. Lipoma (a slow-growing, doughy mass that's usually harmless)
  8. Mastitis (an infection in breast tissue that most commonly affects women who are breast-feeding)
  9. Milk cyst (galactocele) — a milk-filled cyst that's usually harmless

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