Objectives: To estimate the prevalence of nipple traumas and to correlate this occurrence with socio-demographic and obstetric factors in a sample of assisted post-partum patients in a teaching hospital. Method: Cross-sectional, quantitative study of 320 post-partum patients assisted in the maternity from October 2015 to October 2016. Results: The prevalence of nipple trauma in the sample was 35.3%, and only previous experience with breastfeeding has behaved as a protective factor for trauma. No statistical associations were found with other variables. Conclusions and implications for practice: The data presented allowed us to delineate a profile of the post-partum patients assisted in a teaching hospital, as well as the characterization of the occurrence of nipple traumas. From this profile, guidelines can be established on the subject, both in the institution where the study was carried out and in other institutions, since from the literature, the need for this orientation in different contexts and institutions is identified.