Throughout their lifetimes, women will experience changes in their moods as a consequence of aging. From puberty to post-menopause, these physical, emotional, and physical changes can be confusing and concerning. In Session 1, Liisa Hantsoo, a clinical psychologist and assistant professor, addresses changes in mood related to menstrual cycles. This lecture will focus on a range of mood symptoms that may occur across the monthly cycle, ranging from mild irritability to severe premenstrual dysphoric disorder (PMDD).