Premenstrual syndrome (PMS) is a condition that affects a woman’s emotions, physical health, and behavior during certain days of the menstrual cycle, generally just before her menses. PMS is a very common condition. Its symptoms affect more than 90 percent of menstruating women. It must impair some aspect of your life for your doctor to diagnose you. PMS symptoms start five to 11 days before menstruation and typically go away once menstruation begins. The cause of PMS is unknown. However, many researchers believe that it’s related to a change in both sex hormone and serotonin levels at the beginning of the menstrual cycle.
The symptoms of PMS are usually mild or moderate. Nearly 80 percent of women report one or more symptom that does not substantially affect daily functioning.
The most common symptoms of PMS include: mood swings, feeling upset, anxious or irritabletiredness or trouble sleeping, bloating or tummy pain, breast tenderness, headaches, spotty skin or greasy hair, changes in appetite and sex drive.