Knowing your body well will help you know normal changes and one that need medical attention.Having regular check up give you great defense against diseases.
Following are some symptoms to look for:
==>Unfamiliar pain in the breast or in the armpit-unusual in sense that pain is different from how how you feel when you have monthly periods,also if it u feel it in one or both breasts.If it is not caused by hormonal changes or just in one breast or armpit.go to the doctor and be checked out.
==>A lump or a tumor in the breast or in the armpit-Sometimes is caused by hormonal changes but if it persist,don't wait before it is too late .Go for screening and know the cause of swelling.
==>A change in size or shape of the mature breast-If you notice any changes in a mature breast more if it's occurring on one breast only.That is a cause for alarm to seek health professional for breast examination.
==>Fluid other than milk leaking from the nipple-on you menopause you may experience non-blood leakage from nipples of both breast due to hormonal changes,but if it occur on one breast only,then you need medical attention.
==>Change in size of the nipple-when your body weight change it is natural for nipple to change it's size too.But if it retracts in and doesn't return to its normal shape, seek help from your doctor for a manual exam. If there is a problem below the surface of the nipple then having a diagnostic mammogram or ultrasound may be the best option.
==>Changes of color, shape or texture of the nipple -If you notice puckers, a rash on the nipple skin or darker skin that around the nipple.If after using some cream still doesn't help,then don't waste more time consult doctor when still in curable stage.
However know that breast implants, usage of antiperspirants, and wearing under wire bras do not raise your risk for breast cancer. There is no proven evidence yet to link breast cancer and abortion.