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Can COVID-19 vaccines affect the menstrual cycle (period)?

Question: 

Can COVID-19 vaccines affect the menstrual cycle (period)?

Answer: 
Recent research studies have shown that people who menstruate may observe no changes in their periods after COVID-19 vaccination or they may observe small and temporary changes, including:
 
  • Longer menstrual periods.
  • Shorter time between periods.
  • Heavier bleeding than usual.
Despite these temporary changes in menstruation, there is no evidence that COVID-19 vaccines cause fertility problems.
Date last reviewed: 
Tuesday, Oct 10, 2023