By Rachel Crowe, June 28, 2022

Hormones are to blame for menstrual irregularity, explained Kecia Gaither, M.D., board-certified in OB-GYN and maternal-fetal medicine, and director of perinatal services at NYC Health + Hospitals/Lincoln in the Bronx in New York City. “Both time frames—early episodes of menstruation or last episodes of menstruation—involve hormonal flux and irregular, erratic menses,” she said. “When estrogen levels are higher in comparison to progesterone, the uterine lining thickens and builds. As such, this results in heavier bleeding.”

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