PMS3, or Premenstrual Syndrome 3, refers to a specific classification of premenstrual syndrome that includes a range of emotional and physical symptoms experienced by individuals in the luteal phase of their menstrual cycle. Symptoms may include mood swings, irritability, fatigue, and physical discomfort, which can significantly impact daily life. This condition is part of a broader spectrum of PMS disorders, with PMS3 often characterized by more severe symptoms. Treatment options may include lifestyle changes, dietary adjustments, and, in some cases, medication to help manage the symptoms effectively.