At the age of 48, menstruation comes back 11 days after the period is clean, which may be caused by hormonal imbalance in the body, or gynecological diseases such as uterine fibroids, endometrial polyps, cervical polyps, and so on. 1. Hormonal imbalance in the body: when female patients are 48 years old, estrogen in the body begins to decline, and the level of hormones in the body is prone to fluctuations, which may lead to menstrual disorders and frequent menstrual symptoms such as menstruation coming back 11 days after the period is clean. You can take oral medication under the guidance of a doctor, such as progesterone to regulate the level of hormones in the body, to achieve the purpose of stopping bleeding and regulating menstruation. 2. Gynecological diseases: for example, uterine fibroids, endometrial polyps or cervical polyps and other diseases can cause irregular bleeding. If a 48-year-old female patient has irregular bleeding, she needs to go to the hospital in time to improve the gynecological examination to determine the cause of the disease and then timely treatment to avoid delaying the condition.