Having one breast slightly bigger than the other is not unusual, however, if you notice any sudden changes in the size of your breast(s)

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What Are the Signs and Symptoms of Breast Cancer?

Warning Signs of Breast Cancer

Why Breasts Are Sometimes Uneven

How to do a Breast Self-Exam (BSE)

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Breast Asymmetry: Causes, Risks & Treatments

What Determines Breast Size, Breast Shape, and Changes