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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 studies have shown that people who menstruate may observe small, temporary changes in menstruation after COVID-19 vaccination, 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, Feb 14, 2023