Stand shirtless in a well-lit room in front of a mirror with your arms at your sides. Check each breast for: Breast Self-Exam: Get to Know Your Breasts in 5 Steps

Choose a specific, easy-to-remember day each month (e.g., the 1st of the month). Step 1: Visual Inspection (In Front of a Mirror)

The best time is 3 to 5 days (or up to a week) after your period starts. This is when breasts are typically least tender and lumpy.