Around the time your period is due, hormones are raging through the body. You may experience fairly dramatic mood swings as well as physical aches and pains. If you do, you are experiencing something called per-menstrual syndrome (PMS). PMS is extremely common, and can occur up to 10 days before your period is due. Symptoms can range in degrees of severity, with most women experiencing mild symptoms. However, some of us experience more severe pain and it’s essential to seek the advice of your GP to help ease symptoms.