Premenstrual syndrome (PMS) is a group of unpleasant symptoms that many women experience on a monthly basis, typically between ovulation and menstruation.

While the cause isn’t entirely known, medical experts believe it involves hormonal changes during the menstrual cycle.

Symptoms can vary in severity and frequency, but women who experience PMS often report pain in the breast, abdomen, lower back, joints, muscles and/or pelvis.

PMS symptoms also frequently includes gastrointestinal upset, bloating and abdominal cramping, as well as mood swings, anxiety, depression, acne, headache, insomnia and problems with concentration, according to the Mayo Clinic.

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