If the patient has a menstrual blood reflux during this sexual life, it is not excluded that it can cause endometriosis and other diseases. If the body has low immunity and poor resistance, pathogens such as bacteria can also cause gynecological inflammatory diseases. However, some female patients are in good health and do not have menstrual blood reflux during sex, just one intercourse will not cause the occurrence of diseases, so it is necessary to analyze and judge according to the specific situation of the specific patient. It is recommended that patients should usually pay attention to keep their genitals clean and hygienic and try to avoid having sex during menstruation to avoid the occurrence of diseases and serious damage to their health.