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See also: Breast lumps and cancer
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:
In: Abeloff MD, Armitage JO, Niederhuber JE, Kastan MB, McKena WG, eds. Clinical Oncology. 4th ed. Philadelphia, Pa: Elsevier Churchill Livingstone; 2008:chap 95
Whitman GJ. Ultrasound-guided breast biopsies. Ultrasound Clin. Dec 2006; 1(4); 603-615.
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