Returning to menstruation after six months of menopause at the age of 50 may be a menstrual disorder during perimenopause, or it may be related to diseases such as cervical cancer or endometrial cancer. Coming back after six months of menopause may be a perimenopausal menstrual disorder, caused by the decline of ovarian function. When an occasional follicle develops in the ovary, estrogen is secreted to stimulate the growth of the endometrium, and vaginal bleeding occurs when the endometrium sheds. However, coming back after menopause can also be related to diseases. Gynecological diseases such as cervical cancer and endometrial cancer can also cause vaginal bleeding. Therefore, a 50-year-old woman who has menstruation again after six months of menopause should go to the hospital for an ultrasound examination to observe the thickness of the uterine lining and whether the echo is uniform, and if necessary, a hysteroscopy should also be done to clarify the cause of the bleeding, and treatment should be carried out under the guidance of the doctor.