How come I have skipped periods, but nobody else in the family has menstrual problems?

Missed Menses. Missed menses is not strictly a genetic disorder, so no one else need have symptom. We are finding genetic involved in more issues though. Common reasons for missed menses include pregnancy :), pco, hormone imbalance (thyroid, prolactin), weight changes (up or down), stress (usually physical), medications and unknown causes. We have good treatments. Talk with your doc.