Menstrual reflux refers to the bleeding that may also occur when the accumulated blood in the uterine cavity reaches the pelvic cavity through the fallopian tubes during a woman’s menstrual period, or when the endometrium bleeds from other parts of the uterus outside the pelvic cavity, such as the nasal tract, external ear canal or esophagus. These are a kind of extra-uterine bleeding, which is caused by the ectopic endometrium being subjected to a drop in the body’s hormone level and the endometrium peeling off. Women should pay attention to keep local cleanliness and hygiene during this period, as bleeding is not too much and usually does not have a negative impact on the body, but if it is more, it can easily lead to menstrual disorders and endocrine disorders. Women should also pay attention to proper rest, maintain a regular lifestyle, eat more nutritious food, and exercise properly to enhance physical fitness, which is also conducive to endocrine balance and prevent the backflow of menstrual blood.