Breast pain (mastalgia) is a common type of discomfort among women, affecting as many as seven in 10 women at some point in their lives. About 10 percent of women have moderate to severe breast pain more than five days a month. In some cases, severe breast pain lasts throughout the menstrual cycles. The symptom occurs most frequently in young, premenopausal and perimenopausal women. Breast pain alone rarely signifies breast cancer. Still, if you have unexplained breast pain that persists, get checked by your provider.
Most of the time, it's not possible to identify the exact cause of breast pain. Likely contributors are hormonal changes, anatomical issues (breast trauma, prior breast surgery, or chest wall pain), breast size, and medication use (oral contraceptives, infertility treatments, estrogen/progesterone hormone therapy, and some antidepressants).
Make an appointment with your doctor if you have breast pain that persists daily for more than a couple of weeks, if your breast pain seems to be getting worse over time, or if it interferes with daily activities. Also see your doctor if you have pain in one particular area within your breast.
Adopted from www.mayoclinic.com