Premenstrual Syndrome 3 (PMS 3) is a severe form of premenstrual syndrome that affects some individuals in the luteal phase of their menstrual cycle. Symptoms can include intense mood swings, irritability, anxiety, and physical discomfort, which can significantly impact daily life and relationships. Diagnosis of PMS 3 typically involves tracking symptoms over several menstrual cycles to determine their severity and frequency. Treatment options may include lifestyle changes, dietary adjustments, and, in some cases, medication to help manage symptoms and improve quality of life.