Covid vaccines may temporarily delay women’s menstruation, study finds

Dr Alison Edelman said: “Some individuals experience a slightly longer cycle length with the Covid-19 vaccine, and, for most, it goes back to normal quickly.”

Covid-19 vaccines may temporarily delay women’s menstruation by about one day with no risk to reproductive health, a large international study has found.

Women have said they experienced changes in menstrual cycles following vaccinations but there has been little clinical study of this phenomenon.