¦ PMS cause unclear, but there's treatment

delawareonline ¦ : "Premenstrual syndrome, or PMS, is a well-known condition that affects 85 percent of women ages 20 to 40. PMS usually occurs about two weeks before the onset of menstruation, and symptoms most often include irritability, mood swings, breast tenderness and crying spells. Other symptoms include acne, bloating, diarrhea, constipation, salt or sugar cravings, insomnia, headache, anxiety and difficulty concentrating."