Firstly, in the high-risk group, (i.e.) after the age of 20, on the 5th day of periods of every month, a woman should feel their breasts by palpating it and find out if there are any abnormal lumps, thickening, or inversion of the nipple. Normally, it is advisable to do a self-breast examination at the age of 40. It is complementary to mammograms.