• Home

Home > Medical Reference > Encyclopedia (English)

Toggle: English / Spanish

Lumps in the breasts

• Overview
• Symptoms
• Treatment
• Prevention

Definition:

There are many causes for lumps in the breast. These range from normal changes in your body to abnormal breast disease. Breast lumps are either benign (noncancerous) or malignant (cancerous).

See also: Breast lumps and cancer

Causes, incidence, and risk factors:

Some lumps are age-dependent. Newborn boys and girls both have lumps of enlarged breast tissue beneath the nipple, which have been stimulated by the mother's hormones. These disappear within a few months of birth.

Beginning as early as age 8, girls may develop tender lumps beneath one or both nipples (frequently only one). These lumps are breast buds and are one of the earlier signs of the beginning of puberty.

Boys at mid-puberty (usually around age 14 or 15) may develop tender lumps beneath one or both nipples, also in response to the hormonal changes of puberty. These tend to disappear over a period of 6 months to 1 year. See: Gynecomastia

It is also important to remember that hormonal changes just prior to menstruation may give a lumpy or granular feeling to the breast tissue.

The discovery of a lump in the breast usually brings the thought of breast cancer immediately to mind. Breast cancer may occur in men and women, but it is much more common in women. For specific information, see the article on breast cancer .

However, it is important to remember that 80-85% of all breast lumps are benign, especially in women under age 40. Benign causes of breast lumps include:

• Breast infection (breast abscess)
• Fibrocystic breast disease
• Fibroadenoma
• Fat necrosis (damage to some of the fat tissue within the breast; a fat necrosis mass cannot be distinguished from breast cancer without biopsy )

References:

Saslow D, Hannan J, Osuch J, et al. Clinical breast examination: practical recommendations for optimizing performance and reporting. CA Cancer J Clin . 2004; 54:327-344.

• Review Date: 7/17/2007
• Reviewed By: Robert Hurd, MD, Professor of Endocrinology, Department of Biology, Xavier University, Cincinnati, OH, and physician in the Primary Care Clinic, Cincinnati Veterans Administration Medical Center, Cincinnati, Ohio. Review provided by VeriMed Healthcare Network.

A.D.A.M., Inc. is accredited by URAC, also known as the American Accreditation HealthCare Commission (www.urac.org). URAC's accreditation program is the first of its kind, requiring compliance with 53 standards of quality and accountability, verified by independent audit. A.D.A.M. is among the first to achieve this important distinction for online health information and services. Learn more about A.D.A.M.'s editorial process . A.D.A.M. is also a founding member of Hi-Ethics (www.hiethics.com) and subscribes to the principles of the Health on the Net Foundation (www.hon.ch).

The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed physician should be consulted for diagnosis and treatment of any and all medical conditions. Call 911 for all medical emergencies. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. Copyright 1997-2007 A.D.A.M., Inc. Any duplication or distribution of the information contained herein is strictly prohibited.