The normal menstrual period for women is usually 3-7 days, if it is longer than that, it is called dysmenorrhea. The causes of incomplete menstruation may lead to reproductive tract infections or anemia, and need to be promptly identified and treated for the following reasons: 1. The most common is pregnancy. Many people feel that they will not get pregnant when they have their period, but this is not the case, as pregnancy may result in bleeding, like pre-eclampsia. If there is a need for pregnancy, we should go to the hospital in time and use medicine to protect the fetus; 4. There is also a possibility that the embryo does not develop, and this situation may result in sudden hemorrhage and infection, which should be dealt with in time; 5. Ectopic pregnancy may also result in dripping menstruation, which is actually not normal menstruation, but abnormal uterine bleeding. External factors, such as great emotional fluctuations, exertion, etc.; 7. Emergency contraceptive pills or a lot of physical activities during menstruation, as well as the use of blood-boosting drugs may also lead to incomplete menstruation.