Why do my breasts feel sore before my period?

Why do my breasts feel sore before my period?

Breast Pain during Irregular Periods

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Breast Pain and Tenderness Before Period

My breasts usually start hurting before my period comes. However, my breasts have not started to hurt and my period is supposed to come in a day. Is this a sign of

Breast Changes During Menstrual Cycle

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Breasts still sore after period ends: Is it normal?

5 Tips to Reduce Breast Pain Before Periods

Breast Pain, Causes, Types & Symptoms