The nightmare usually lasts 4-6 weeks. Due to its color, content and time, the nightmare is divided into bloody nightmare, plasma nightmare and white nightmare, as follows: 1. bloody nightmare: named because it contains a lot of blood, bright red color, large amount, sometimes small blood clots, bloody nightmare usually lasts 3-4 days; 2. plasma nightmare: named because it contains a lot of plasma, light red color, plasma nightmare lasts about 10 days. The plasma gradually decreases and the white cells increase, turning into white malodex; 3. White malodex: usually lasts for 3 weeks. If the uterus is not fully restored, or if some placenta or fetal membranes remain in the uterine cavity, or if there is an increase in malodor when combined with infection, and if the bloody malodor lasts longer and has a foul odor, you need to go to the hospital in time to use drugs for treatment.