Aunt in medicine refers to menstruation, menstruation after 10 days and then come again may be ovulation bleeding, cervicitis, endometrial polyps, submucosal uterine fibroids and other causes. 1. Ovulation bleeding: women suffer from endocrine dysfunction due to prolonged tension, stressful life, dieting and other reasons, poor follicular development, decreased estrogen, decreased progesterone levels after ovulation, and shedding of the uterine lining, resulting in ovulation bleeding. Most of the bleeding is small, and the bleeding stops by itself in 1~3 days. 2. Cervicitis: pathogens infect the cervix, leading to congestion, edema, epithelial degeneration of the cervical mucosa. Cervicitis can cause increased vaginal discharge, intermenstrual bleeding, contact bleeding and so on. Cervical polyps are caused by chronic inflammation stimulating the cervix causing local glandular and mesenchymal hyperplasia, cervical polyps are brittle and easy to bleed, which can lead to contact bleeding and bleeding between periods. 3. Endometrial polyps: the etiology is not clear, with chronic endometrial inflammation, estrogen elevation, ectopic stimulation of the uterine cavity and other reasons. Endometrial polyps can cause bleeding between menstrual periods, resulting in menstruation coming back after 10 days. 4. Submucosal fibroids: uterine fibroids grow into the uterine cavity as submucosal fibroids, and when submucosal fibroids become necrotic and infected, irregular vaginal bleeding can occur, causing menstruation to come back after 10 days. In addition, taking certain drugs, intrauterine devices and malignant tumors and other factors can lead to menstruation after 10 days, it is recommended to go to the hospital in time for examination and clear cause of the disease and follow the doctor’s instructions to deal with the treatment.