Oligomenorrhea or scanty menses is defined as when you do not get your period for 35 days or more or when you have only 4 to 9 periods in a year.

The average menstrual cycle is 28 days, and anything from 25 to 35 days is considered normal. So do not panic if you miss a single period (of course in absence of pregnancy; birth control or menopause) in a year; but if you regularly go 35 days or more between periods; you should visit your gynecologist.

Oligomenorrhea occurs in about 13 to 14 % of the general population. This number increases to 20% when women have existing fertility problems.

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