The term “great aunt” refers to menstruation. The first thing to consider is that it is caused by uterine fibroids, pelvic inflammatory disease, cervical polyps and other diseases. 1. Uterine fibroids: Uterine fibroids are benign tumors formed by the proliferation of uterine smooth muscle tissues, the cause of which is not clear at the moment and is mostly related to heredity, sex hormone levels and other factors. The main manifestations of patients are increased leukorrhea and irregular vaginal bleeding. 2. Pelvic inflammatory disease: Pelvic inflammatory disease is a relatively common clinical infectious disease of the upper reproductive tract of women, the cause of which is mainly related to pathogen infection, decreased immune function and other factors. Patients will have abdominal pain, abnormal vaginal bleeding and other symptoms. 3. Cervical polyps: cervical polyps is a cervical tissue hyperplasia caused by the limitation of superfluous organisms, the etiology is mainly related to chronic inflammation, cervical infection and other factors. Patients are mainly manifested as bleeding between menstrual periods, and some patients will have a small amount of blood just three days after the menstrual period. There are many reasons why a woman may have a small amount of blood three days after her menstrual period, so it is recommended that the patient consult a doctor in a timely manner to clarify the cause of the problem and standardize the treatment.