Women's breasts come in many sizes and shapes. In addition, your breasts change during your life because of age, monthly menstrual cycles, pregnancy, menopause, or the taking of medications.

It may be normal for your breasts to feel lumpy and uneven. Sometimes, your breasts may be swollen and tender, especially right before your menstrual period.

By doing monthly breast self-examinations, you can learn what's normal for your own breasts at this point in your life. You will be more likely to find an unusual change that might be a warning of cancer. You can ask your health care provider how to perform a breast self-examination.