attention span . Fibromyalgia is often associated with  anxiety , and depressive  symptoms. [ 7 ]  Fibromyalgia is frequently comorbid with stress-related disorders such as  chronic fatigue ,  posttraumatic stress disorder ,  irritable bowel syndrome  and  depression [ 8 ] . Two studies that employed single-voxel  magnetic resonance spectroscopy  (1H-MRS) reported metabolic