Why Do I Get Nauseous Before My Period?
Medically reviewed by Andre Stone | MD, University of Pittsburgh School of Medicine on August 25th, 2026.
Nausea can occur before a period and may be related to hormonal changes during the menstrual cycle. Changes in estrogen and progesterone before menstruation, along with prostaglandins released around the start of a period, may contribute to nausea, cramping, and other digestive symptoms. Prostaglandins help the uterus contract and can also affect the digestive tract. Additionally, serotonin levels fluctuate with hormonal changes, impacting mood and digestion. Skipping meals or not eating enough may make nausea feel worse for some people. When nausea is related to the menstrual cycle, it may occur in the days before a period and improve after the period begins, although timing varies and symptoms can continue during menstruation.
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