Premenstrual Dysphoric Disorder (PMDD) is a severe form of premenstrual syndrome (PMS) that affects a small percentage of women. It typically occurs in the luteal phase of the menstrual cycle, leading to significant emotional and physical symptoms. Common symptoms include mood swings, irritability, depression, anxiety, fatigue, and physical discomfort. Diagnosis of PMDD is based on symptom patterns and their impact on daily life. Treatment options may include lifestyle changes, medication, or therapy. Understanding PMDD is essential for those affected, as it can significantly impact quality of life and relationships.