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Normal menstrual cycle lasts within 21 to 35days. Abnormal menses can be quite annoying and a call for concern. In adolescent girls, the main cause is an immaturity of the hormonal
axis from the brain to the ovaries that controls ovulation. This usually results to a failure of the ovary to release an egg and consequently the corpus luteum
(a body which forms after egg release) does not form. As a result, estrogen
is continuously secreted thereby maintaining the uterine lining and no menses occurs. This condition is term anovulatory cycles and can be associated with heavy bleeds and inter-menstrual bleeds. it is typical in adolescence within 1-5 years after their first menses. Stress
and physical exercises can also cause abnormal menses.
General, when the hormonal axis matures, cycles become normal. However, you could see a gynecologist to rule out the possibility of other causes and to be re-assured.