Chronic fatigue syndrome causes

Overview

 * The exact cause of chronic fatigue syndrome (CFS) is unknown.


 * Some theories suggest CFS may be due to:
 * Epstein-Barr virus or human herpes virus-6 (HHV-6); however, no specific virus has been identified as the cause
 * Inflammation in the nervous system, because of a faulty immune system response


 * The following may also play a role in the development of CFS:
 * Age
 * Previous illnesses
 * Stress
 * Genetics
 * Environmental factors


 * CFS most commonly occurs in women ages 30 to 50.