Can stress be the reason for a missed period?

Absolutely: 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 (polycystic ovary syndrome or asherman’s syndrome). #1 reason is pregnancy.

Stress and periods: Yes, emotional stress and physical stress (anorexia, or chronic illness) can cause missed periods. Blood pregnancy tests can be helpful if urine tests are negative in the setting of a truly missed period. If periods are missed for 3 consecutive menstrual cycles in an adult female, formal evaluation and testing by your family physician and gynecologist is warranted.