Premenstrual Syndrome (PMS)

What Is It?

Premenstrual syndrome (PMS) is a collection of symptoms that many women experience during the one to two weeks before a menstrual period. These symptoms may be physical, psychological and emotional. They disappear soon after the start of menstrual bleeding.

Researchers are not certain what causes PMS. The most popular explanation is that PMS symptoms are related to cyclic changes in:

To continue reading this article, you must login.
  • Research health conditions
  • Check your symptoms
  • Prepare for a doctor's visit or test
  • Find the best treatments and procedures for you
  • Explore options for better nutrition and exercise
Learn more about the many benefits and features of joining Harvard Health Online »