The objective of this paper is to consider from a public health perspective the types of questions researchers might be asking about the relationship between menstrual function and womenβs health, and to evaluate to the extent to which these questions have or have not been addressed by the scientific community. Based on the findings in this report, it is obvious that a comprehensive program of research is needed in order to begin filling the myriad gaps in scientific knowledge about the menstrual cycle. Given the lack of knowledge about many fundamental aspects of menstrual function and about linkages between the menstrual cycle and other physiologic systems, the importance of conducting basic research cannot be underestimated. The report offers specific recommendations for research priorities