What are some causes a woman to miss her menstraul cycle?

Let try to help you: The most common reason women miss their periods is pregnancy. Hormonal disorders such as polycystic ovary syndrome can cause amenorrhea, as can hormone-based contraceptives such as oral, injectable, and patch contraceptives, as well as certain types of iuds. Stress, excessive exercises, dieting and anorexia nervosa.

Late periods: Reasons for missed/late periods: low body weight, obesity, marked weight ^ or v, over-exercise, endurance athletics, breast-feeding, ^ stress, illness, eating disorders (bulimia or anorexia), anovulatory cycle (no egg released), travel, hormone irregularities, drug use, meds (i.e., birth control) or medical problems (i.e. PCOS). #1 reason is pregnancy.