what are reasons for irregular periods?
Amenorrhoea (absence of periods) can be divided into 2 categories: primary and secondary:
Primary amenorrhoea is when menses have not occurred by the time of the expected menarche - about 14 yrs of age.
Secondary amenorrhoea is when menstruation has previously occurred but it has stopped for at least six consecutive months.
I am assuming you are inquiring about secondary. Here is a link with more information.
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