Premenstrual syndrome, or PMS, is a group of symptoms that start one to two weeks before menstruation. Most women have at least some symptoms of PMS, and the symptoms go away after their periods start. For some women, the symptoms are severe enough to interfere with their lives, which is a type of PMS called premenstrual dysphoric disorder (PMDD).[1]
What is PMS?
Written by:
Fact-checked
by:
•Last Updated: May 16, 2025
Premenstrual syndrome is a collection of symptoms that occur 1 to 3 weeks before menstruation and typically resolve once menstruation begins. In some cases, symptoms can be severe enough to disrupt daily life, leading to a more intense form known as premenstrual dysphoric disorder.