Chronic visceral pelvic pain disorders cause substantial morbidity and cost upwards of 50 billion dollars in lost US wages and health care expenditures. Visceral pelvic pain conditions, such as endometriosis-associated pelvic pain, irritable bowel syndrome, bladder pain syndrome, are common (~25% prevalence in women), but predictable and may be preventable. The causes of visceral pain are poorly understood because diagnostic tests do not exist to distinguish pain due to prima