Am 58 years old and have been postmenopausal for 2.5 years. Recently, my breasts were extremely tender for about a week. When the tenderness went away, I got a period the following day. I bled for about a week (light to medium flow). Bleeding stopped for 2 days then returned for another 7 to 10 days. Again very light with some mild abdominal cramping and tiny clots passing. The bleeding stopped again. This time for about 5 days. Then began lightly with the passing of small dime sized clots on occasion. I am experiencing mild cramping on occasion. I have never been on HRT, and am not overweight. During perimenopause, my periods were often irregular, heavy (even flooding on a few occasions) with the passing of very large clots. Any idea what could be causing this?