Previous scientific studies documenting the objective existence of a coming together of the onset of menstrual cycles between or among women do not discuss the subjective meaning of the experience of menstrual synchronization from the perspective of women studied. This article discusses a phenomenologic study, based on 13 taped interviews and 2 written follow-up interviews, with women aged 25 to 46. Data were analyzed using a qualitative, naturalistic method along with a computer program. The analysis focused on the lived experience of menstrual synchronization. Four themes with respective subthemes emerged, producing descriptions of menstrual synchronization. The descriptions discovered can assist nurses to understand the holistic aspects of this everyday experience of women and to design effective strategies and techniques to help women gain knowledge about their cycle functions, promote healthy attitudes toward menstruation as a process, and acknowledge and honor this natural, healthy aspect of their menstrual cycle.