Chronic fatigue syndrome (CFS) is a long-term illness with a wide range of symptoms including severe and debilitating fatigue, painful muscles and joints, disordered sleep, gastric disturbances, poor memory and concentration. I do not go into details of CFS/ME other than consider its links with IBS, fibromyalgia and hypothyroidism. CFS/ME appears to be a diagnosis that is often made when no other is found. Perhaps there are many causes of CFS/ME but hypothyroid patients are often misdiagnosed with CFS/ME.