Regular self-examinations of your breasts can catch cancer before it spreads. Every woman should know the proper way to perform a breast self-exam, and should do the exam monthly. When you familiarize yourself with your breasts, it is easier to identify any changes that may happen. Breast cancer symptoms are often unnoticeable without a professional medical screening. However, some symptoms can be identified early. Being proactive about the health of your breasts can help catch the signs before cancer spreads.