Bloody malignant discharge is usually seen 4-5 days after delivery. The duration of bloody malignant discharge varies depending on the mode of delivery. In case of normal delivery, the duration is usually less than 9 days, and in case of cesarean delivery, it can be completely clean in about 15 days. If the bloody nightmare lasts longer, it may be due to excessive dietary supplements, such as ginseng and antler; poor contraction of the uterus, such as poor physical condition and poor rest, which leads to poor uterine regeneration, thus opening the blood sinus; residual intrauterine tissues, such as placenta or fetal membrane residue affecting uterine contraction; intrauterine infection, if the nightmare has obvious odor and is accompanied by purulent discharge, fever and other manifestations, it may be a puerperal infection Intrauterine infection If it persists beyond the normal time, it is recommended to go to the gynecology department of the hospital for symptomatic treatment under the guidance of a doctor.