Sorry, didn't mean to be a drama queen or scare you.
I thought you were still having regular periods. If that were the case, I would suspect a hormone imbalance, ask you if you were underweight, try to figure out reasons for SKIPPING periods...
But knowing you have had menopause does change things because now I am trying to figure out why you are HAVING periods.
Let me state up front that I have not hit that phase in life yet, so I am only going on what I have heard or read, not from experience. One thing to take into consideration is the amount of time that has passed since your periods ceased. If it has been six months or less, it is not a very big deal- although it warrants a doctor visit. If it has been more than six months since you last had a period, then other causes are more likely.
According to one health website I visited, bleeding from the upper reproductive system (in postmenopausal women) can be caused by:
•hormone replacements
•endometrial cancer
•endometrial polyps
•cervical cancer
•cervical lesions
•uterine tumors
•ovarian cancer
•estrogen-secreting tumors in other parts of the body