About 3% of all breast cancers occur in women under the age of 35. Although it is rare in young women; cancers in this age group have a worse prognosis.

Breast cancer is very rare in young women between the ages of 13 and 19.

A family history of breast cancer, genetic and environmental factors, radiation therapy involving the breast area due to another disease, use of birth control pills, and pregnancy are thought to be risk factors for breast cancer in young people with varying degrees of effectiveness.

The most important risk factor for breast cancer is age. Less than 1% of breast cancers occur in women under the age of 30, and the risk of a woman developing breast cancer before the age of 30 is 0.44%.