Fang X, Huan Y, Tao Y, et al. - Researchers examined the incidence, intensity, as well as risk factors for postpartum uterine contraction pain in this prospective, observational, single-institution study. Participants were women with singleton pregnancies who delivered vaginally. Overall 265 nulliparous and 139 multiparous women were analyzed. Significant uterine contraction pain within 48 h of delivery was experienced by 47% of women. A lower risk of significant postpartum uterine contraction pain was observed in nulliparous women vs multiparous women, in the generalized mixed model. A higher risk of significant postpartum uterine contraction pain was reported in females with a history of dysmenorrhea. More intense uterine contraction pain was experienced by both nulliparous and multiparous women while breastfeeding. In this study population, the occurrence of postpartum uterine contraction pain was a common finding, and this pain was severe in some women. Significant risk factors for significant postpartum uterine contraction pain were: parity and history of dysmenorrhea.