See below: Menstrual irregularities are not uncommon. Anovulatory cycles are one cause. You may wish to consult this site for more information. http://www.nichd.nih.gov/health/topics/menstruation/conditioninfo/pages/causes.aspx
Answered 3/19/2015
3.9k views
Reason?: Reasons for missed /late periods: low body weight, obesity, marked weight gain or loss, over-exercise such as in endurance athletes, breast-feeding, stress, illness, eating disorders (bulimia or anorexia), travel, hormone irregularities, drug use, medications (i.e., birth control) or med problem (polycystic ovary syndrome or Asherman’s syndrome. #1 reason is pregnancy.
Answered 11/11/2018
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