PMS is short for Premenstrual Syndrome. A week or so before menstruation the body begins making more of the hormones estrogen and progesterone. These hormones can cause feelings and symptoms that together are called PMS. Symptoms of PMS can include cramps, tender breasts, sore back, tiredness, bloating, headaches and feeling irritable or emotional.
Not everyone experiences the same symptoms of PMS, and some people might not have any symptoms at all.