Breast Self-Examination
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What part of my breast should I examine?
You should examine your whole breast each month. This is a larger area than you might think.

The boundaries of your breast tissue are:

On the bottom: The braline On the top: The collarbone or shoulder bone On each side of each breast: A line midway between your breasts, and a line on your side extending down from the armpit, which includes the area just beyond breast fullness.