The reason why a 50-year-old woman comes back after 5-6 days of menstruation may be caused by ovulation bleeding, endocrine disorders, and other reasons. 1. Ovulation bleeding: under normal menstrual cycle, if there is a small amount of bleeding about 14 days before menstruation, it may be ovulation bleeding, this bleeding time is short and small amount, usually about 1-3 days will be clean, is a normal physiological phenomenon without treatment. 2. Endocrine disorders: women between the ages of 45-55 years old have entered menopause, due to the decline in ovarian function of the body’s hormone level is insufficient, it is easy to lead to functional uterine bleeding phenomenon. 3. Other: uterine fibroids, adenomyosis, endometrial polyps, endometrial cancer, pelvic inflammatory disease, pituitary disease, cervical cancer, etc. may lead to abnormal bleeding phenomenon. 50-year-old women menstruation after 5-6 days again need to go to the hospital in time, by the doctor according to the specific conditions, to formulate individualized diagnosis and treatment plan, so as to avoid delaying the condition.