Oligomenorrhoea is infrequent or very light menstruation. It usually refers to women who had normal menstruation in the past but are now experiencing sparse menstruation.
With this condition, periods occur at intervals of greater than 35 days. As a result, there are usually fewer than nine periods in a given year.
Oligomenorrhoea should not be mixed up with amenorrhoea, which is the absence of periods. However, oligomenorrhoea can develop into amenorrhoea, if infrequent periods stop altogether.
There are a number of factors which may cause a woman to have infrequent periods:
Polycystic ovary disease (POCD): Also known as polcystic ovary syndrome (POCS), this is a condition in which the ovaries become filled with small cysts.
Treatment depends on the cause. If oligomenorrhoea is caused by some underlying condition such as bulimia or polycystic ovaries, then that condition must be treated. Menstruation may then return to normal.
Likewise if the condition is causes by a strict training regime, this may have to be altered before menstruation will return to normal.
Sometimes oligomenorrhoea requires no treatment. This is often the case with adolescents who have recently started to have periods and women who are coming up to their menopause.