You may experience menstrual cramps when you have menstrual cramps. When the uterine lining that is shed after childbirth is mixed with blood and is discharged through the vagina, it is called “bad diarrhea”. The discharge has a certain taste of blood, but no odor, and lasts for 4 to 6 weeks. It is accompanied by post-partum contractions to promote discharge, so the discharge may be accompanied by contraction pains similar to menstrual cramps, which are generally tolerable and get milder and milder. According to the color, content and time of the discharge, it can be classified into bloody, plasma and white discharge, and the amount will gradually decrease with the prolongation of the postpartum period. When the uterus does not recover well after delivery, or when there is part of the placenta or fetal membranes left in the uterus, or when there is a combination of infections, the duration of bloody discharge may be prolonged, and prompt medical attention is needed.