Normal menstrual blood has a light bloody odor. If the taste of menstrual blood is abnormal, the appearance of obvious odor is an abnormal performance. This symptom may be caused by gynecological diseases.1, endometritis is the main reason for the abnormal taste of menstrual blood. Inflammatory secretions in the uterine cavity cause the menstrual blood to have an obvious odor.2. Suffering from gynecological malignant tumors such as endometrial cancer and cervical cancer can cause the menstrual blood to have a foul odor.3. Some women who do not have serious gynecological diseases, but have poor personal hygiene habits, and do not change the sanitary napkins and sanitary napkins for a long period of time during the period, can also cause the menstrual blood to have a special odor.