Physiologic amenorrhea

The cessation of menstruation that it is completely normal and is not caused by anything pathologic.

The lack of menstruation during pregnancy is a form of physiologic amenorrhea.

Amenorrhea during lactation is another.

Amenorrhea is conventionally divided into primary and secondary amenorrhea.

With primary amenorrhea, menstruation never takes place.

It fails to occur at puberty.

With secondary amenorrhea, menstruation starts but then stops.

Physiologic amenorrhea is a subset of secondary amenorrhea.

The word 'amenorrhea' is compounded from three Greek roots 'a-', no + 'men', month + 'rhoia', flow = no monthly flow.

Amenorrhea is less commonly called amenia