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How do breasts change during one's menstrual cycle?

Breasts can change during one’s menstrual cycle due to a surge in hormones just before ovulation, which can cause breast enlargement. There is increased blood flow to the tissues, which leads to swelling, stretching and increased pressure. This is why some women have breast pain just before their menses begin.

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You may find that your breasts feel fuller and are more sensitive when you're ovulating; and, in fact, they actually do get bigger because of water retention and additional blood flow. This is also when they're most likely to be the same size, however; one study found that breasts have the least amount of asymmetry on the first day of ovulation. During menstruation, breasts shrink again.

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.