ABSTRACT
Many theories abound as to the cause of CFS, but none have been proven conclusively. Because of the prevalence of the condition in many different countries throughout the world, it is becoming increasingly necessary to find a common link in the causative mechanism. The cause must be present at an international level. The overgrowth of bowel yeast and its infiltration through the bowel wall into the blood stream would appear to be the starting point in the development of CFS. This invasion of yeast can occur for different reasons. Therapeutic interventions based on the years of hypothesis are suggested.