CFS/ME is generally caused by a combination of many factors. It is probable that most if not all, of the factors have been discovered or at least suspected.
They are:--- Parasites, Toxins, Junk food, Stress, wrong level of rest, excercise or sleep, side effects of drugs, physical injury. All known and suspected factors must be eliminated and all measures must be taken to increase health level. Many factors may appear to be of no importance but over many years may be devastating. But they may well be ignored by the medical profession.