There is a foul and unpleasant odor at the end of menstruation considerations related to anaerobic infection, endometrial inflammation, endometrial cancer and other factors, it is recommended to do relevant examinations in a timely manner to clarify the diagnosis, and follow the doctor’s instructions for appropriate treatment. 1. Anaerobic bacterial infection. It occurs in people who suffer from many kinds of basic diseases and low immunity. Typical symptoms of anaerobic bacterial infection, in addition to general inflammatory symptoms, its pus or secretion is accompanied by foul odor, and there is a fishy smell in the vagina at the end of menstruation, accompanied by leukorrhea increase and itching symptoms. 2. Endometrial inflammation. Refers to the endometrium infected with pathogens and inflammation, caused by postpartum, post-abortion and gynecological surgery due to the trauma of the endometrium, bacteria into the trauma caused by infection, the main manifestations of hidden pain in the lower abdomen, fever, menstruation, abnormal vaginal discharge and accompanied by foul smell and so on. 3. Endometrial cancer. A group of epithelial malignant tumors occurring in the endometrium, which is a kind of reproductive endocrine disorder, mainly caused by excessive stimulation of endometrium by estrogen. Vaginal bleeding and menstrual disorders are the main symptoms, and after menstruation, there will be abnormal discharge in the vagina, which often has obvious fishy odor. Daily attention should be paid to hygiene and cleanliness, do not over-wash the vagina to avoid disturbing the balance of bacteria in the vagina. If menstrual abnormalities, it is recommended to go to the hospital in time for examination, to clarify the cause of the disease, and then follow the doctor’s instructions for treatment.