Breast lumps can be caused by:

  1. Breast cancer
  2. Breast cysts — fluid-filled sacs in your breast that are usually benign
  3. Fibroadenoma — a solid, benign mass most common in young women
  4. Fibrocystic breasts
  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.

Oct. 08, 2015