Premenstrual syndrome (PMS) refers to a group of physical and emotional symptoms that many individuals experience in the days leading up to their menstrual period. Common symptoms include mood swings, bloating, breast tenderness, and fatigue. These symptoms typically resolve once menstruation begins. The exact cause of PMS is not fully understood, but it is believed to be linked to hormonal changes during the menstrual cycle. Factors such as stress, diet, and lifestyle may also influence the severity of symptoms. Treatment options include lifestyle changes, dietary adjustments, and, in some cases, medication.