If there is residue inside the uterus, it will cause the following hazards: 1. Because there is residue, when there is peeling between the residual tissue and the uterine wall, it may lead to the opening of large blood sinuses, there will be a lot of vaginal bleeding and it may lead to hemorrhagic shock in a short time, so if there is residue inside the uterus, depending on the specific situation, it is necessary to do a clearance operation if necessary. 2. The irregular bleeding of the vagina indicates that the endometrium is in a relatively relaxed state, which may lead to an increased chance of infection.