Causes of Oligomenorrhea
In healthy individuals, hormonal changes are a sign of building up the lining of women’s uterus to prepare for a fertilized egg each month. When the lining is unnecessary, the tissue will slough off and pass into the vagina via the cervix. This is how a period happens. A normal menstrual cycle should be more or less 4 weeks. This cycle can be affected by some factors, such as side effects of hormonal birth control pills, heavy exercises, and eating disorders like bulimia and nervosa. The condition is also more common in perimenopausal women and adolescent girls because of fluctuating levels of the hormone. [3]
