Periodic fluctuations in women's emotions during the menstrual cycle have been a continuing topic of research and discussion. The current study was designed to determine if premenstrual syndrome conditions in female teachers have any effect on reported classroom misbehavior and infractions. Subjects were twenty-one faculty members presently employed in the capacity of teachers in a public middle school. By utilizing a teacher's daily behavioral checklist, along with student misconduct reports, the changes in teachers' moods and behavioral symptoms over the menstrual cycle were studied in relation to reported student infractions. Based on the results of this study, it appears that menstrual cycle fluctuations have no recognizable impact upon a female's classroom demeanor and her ability to discipline in a professional manner.