Premenstrual syndrome is characterised by a set of symptoms that affect the body and the mood of women. They usually start one to two weeks before menstruation and disappear when it starts. The vast majority of women experience at least one of these symptoms: joint pain, tender and swollen breasts, migraine, acne, fatigue, constipation, irritability, hot flushes, depression, changes in mood, low sex drive, etc. Sometimes they are severe enough to interfere with their normal life. There is no definitive treatment for premenstrual syndrome, but general recommendations include to exercise regularly, take pain killers or evening primrose and follow a healthy diet (avoiding sugars, replacing processed food with whole food, reducing fat).