At the age of 56, when menstruation stops for three months and comes back, it may be a normal physiological phenomenon, but it may also be caused by endometrial polyps, endometrial cancer and other diseases. 1. Normal physiological phenomenon: at the age of 56, when menstruation stops for three months and comes back again, it may be a normal physiological phenomenon. At the age of 56, a normal woman may suffer from irregular menstruation due to the decline in the levels of estrogen and progesterone in her body, and such irregular menstruation is a normal physiological phenomenon. 2. Endometrial polyps: for 56-year-old women, menstruation stops for three months and comes back again may also be caused by endometrial polyps. As the polyps grow on the uterine lining, they may break and bleed, which leads to vaginal bleeding like menstruation, but this situation is not menstruation, but caused by abnormal endometrial polyps. 3. Endometrial cancer: For 56-year-old women, menstruation that stops for three months and comes back again may also be caused by endometrial cancer, accompanied by fluid discharge, odor and so on. It is suggested that once 56-year-old women find that their menstruation stops for three months and comes back, they should consult doctors in time to improve the relevant examination and standardize the treatment.