Retreating bleeding is usually similar to the amount of menstruation, but if there is abdominal pain or if the bleeding exceeds the number of days of menstruation, then it is necessary to be vigilant. Retreating bleeding and menstrual bleeding have the same principle, both are due to changes in hormone levels in the female body, which leads to the shedding of the uterine lining, resulting in the phenomenon of vaginal bleeding. The difference between the two is that the former is triggered by its own hormonal regulation, while the latter is caused by exogenous factors. Therefore, in general, if the patient does not have endometrial lesions or excessive thinning, the amount of bleeding is basically similar to normal menstruation. However, due to the differences in individual physique and endocrine status, the specific bleeding situation of each patient may be different, but generally there are no obvious discomfort symptoms, do not need to worry too much. In summary, if the patient has other obvious symptoms, such as obvious abdominal pain or bleeding time exceeding the normal menstrual period, then we need to be vigilant, and should go to the hospital to avoid delaying the condition.