If your once-predictable menstrual cycle has suddenly started doing strange things - arriving early, disappearing for weeks, or turning into a heavy marathon - you’re not imagining it. Many women notice that sometime in their 40s, their cycle begins to behave very differently from what they’ve known for decades . One month your period arrives every 23 days. The next month it’s nowhere to be seen. Then it comes back with heavy bleeding or intense PMS. While it can feel worryin