Hypomenorrhea

Name(s): 
Oligomenorrhea
Scanty menstruation
Insufficient menstrual flow
Nature

Hypomenorrhea or hypomenorrhoea, also known as short or scanty periods, is extremely light menstrual blood flow. It is the opposite of heavy periods or hypermenorrhea which is more properly called menorrhagia.

Source: Wikipedia

Incidence 
In Chinese medicine, insufficient menstrual flow or lack of menses many mean deficient blood, cold obstructing the blood or congealed blood.
Type 
(G) Very specific problems