What can cause one to undergo menstrual flow twice a month

Question: What can cause one to undergo menstrual flow twice a month
- Keywords:
  menstruation
Asked by 225bm1926 to Grace, Doris, David on 7 Jun 2019.
- Grace Kago answered on 7 Jun 2019: last edited 7 Jun 2019 4:30 pm
  
  Irregular menstrual flow can be due to several causes, so it is hard to pinpoint just one.. This source has a bunch of reasons that include: forgetting to take one’s birth control, it could be irregular bleeding at the start of a pregnancy, the presence of uterine fibroids and polypses, a thyroid that isn’t working properly, an infection, stress, excessive travel and exertion, weight gain/loss
  
  Source:
  https://www.womenshealthmag.com/health/a19976956/period-twice-in-one-month/

Question: What can cause one to undergo menstrual flow twice a month