There are many possible causes for lumps in the breast. Most breast lumps are benign, as in fibroadenoma, a condition that affects mostly women under age 30. Breast abscesses are usually incidental to breastfeeding.
Review Date 11/26/2017
Updated by: Debra G. Wechter, MD, FACS, general surgery practice specializing in breast cancer, Virginia Mason Medical Center, Seattle, WA. Also reviewed by David Zieve, MD, MHA, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.