Theories behind the disease include autoimmunity, for which there is scant evidence, neurogenic inflammation and myofascial pain syndrome. In the latter two categories, dysregulation of the local nervous system due to past traumatic experiences or an anxious disposition and chronic albeit unconscious pelvic tensing lead to inflammation that is mediated by substances released by nerve cells (such as substance P). The prostate (and other areas of the genitourinary tract: bladder, urethra, testicles) can become inflamed by the action of the chronically activated pelvic nerves on the mast cells at the end of the nerve pathways. Similar stress-induced genitourinary inflammation has been shown experimentally in other mammals.