Your menstrual cycle is a process that prepares your body for possible pregnancy. During your menstrual cycle, hormones cause your uterus lining to shed and flow out of your vagina. This is the start of your period.
Everyone’s menstrual cycle is different, and cycles can change at different stages in your life.This section of the website is currently being reviewed. It will be updated in early 2024. Please visit our fact sheets or resources for more information on periods.
This content has been reviewed by a group of medical subject matter experts, in accordance with Jean Hailes policy.
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