“…It is well known that chronic psychoemotional stress and anxiety enhance pain sensitivity in human (Ashkinazi & Vershinina, 1999;Rhudy & Meagher, 2000). Stress has also been found to exacerbate and could contribute to the etiology of chronic painful disorders, such as, fibromyalgia (Clauw, 2009;Wood, 2004), low back pain (Pincus et al, 2002), irritable bowel syndrome (Delvaux, 1999), rheumatoid arthritis (Herrmann et al, 2000) and headache (Nash & Thebarge, 2006). A variety of environmental and/or psychological stressful stimuli have been shown to affect pain sensitivity.…”