The manifestation of [big aunt] is vaginal bleeding, but vaginal bleeding is not necessarily big aunt, but [irregular vaginal bleeding]. Irregular vaginal bleeding refers to the occurrence of vaginal bleeding during non-menstrual period or abnormal amount of bleeding during menstruation. Broadly speaking, in addition to normal menstruation, it can be called irregular vaginal bleeding. We often hear [ovulation bleeding] also belongs to this. What kind of bleeding is [abnormal]? What are the possible causes of abnormal bleeding? We can first consider from the following three aspects: