PMS Underlying Cause
The cause of premenstrual syndrome is unknown, but it seems to be related to changes in hormone levels that occur during the menstrual cycle.
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- Johnson SR. Premenstrual syndrome, premenstrual dysphoric disorder, and beyond: a clinical primer for practitioners. Obstet Gynecol. 2004 Oct;104(4):845-59. 
- Rapkin A. A review of treatment of premenstrual syndrome and premenstrual dysphoric disorder. Psychoneuroendocrinology. 2003 Aug;28 Suppl 3:39-53. 
- Wyatt K, Dimmock P, Jones P, Obhrai M, O'Brien S. Efficacy of progesterone and progestogens in management of premenstrual syndrome: systematic review. BMJ. 2001 Oct 6;323(7316):776-80.