Why are my breasts sore before a period? By Lizzy on December 16, 2018 Fluctuations in hormones before a period are a common cause of sore breasts. In this article, learn more about why breast pain or tenderness often occurs before a period. Source: MedicalNewsToday.com Published in Health News Lizzy More from Health NewsMore posts in Health News »Democratic governors accuse Trump administration of misleading them about vaccine stockpileBiden Outlines Vaccine Plan, Rips Republican Lawmakers for Not Masking UpBiden Outlines Vaccine Plan, Rips Republican Lawmakers for Not Masking UpCan Just a Little Booze Be Harmful?Can Just a Little Booze Be Harmful?How to Thrive in ResidencyHow to Thrive in ResidencyNew Target to Attack in Stomach CancerNew Target to Attack in Stomach Cancer