When you wipe the blood on the 11th day of menstruation, it may be due to dysfunctional uterine bleeding, miscarriage, organic uterine diseases, drug effects and other reasons. 1. Dysfunctional uterine bleeding: the patient’s hormone level is abnormal due to the dysfunction of the reproductive endocrine axis, which leads to abnormal menstruation and continuous bleeding. 2. Miscarriage: Patients who are pregnant and have persistent vaginal bleeding may mistake the bleeding of miscarriage for menstruation. If the vaginal bleeding has not damaged the embryo, timely treatment should be carried out to preserve the fetus. If the embryo has flowed out, but there is still residue in the uterine cavity, it is necessary to carry out timely clearance surgery. 3. Organic diseases of the uterus: such as uterine fibroids, endometrial polyps, cervical polyps and other organic lesions of the uterus, the patient will also have symptoms of irregular menstruation. 4. Drug effects: patients taking hormonal drugs such as short-acting contraceptives, affecting menstruation and abnormal menstrual bleeding. The 11th day of menstruation is already a wipe and blood may be due to many reasons, the patient needs to consult a doctor for examination, to clarify the cause of the disease, and comply with the doctor’s instructions for treatment.