The assessment of the results of a treatment in any particular disorder is generally a very complicated one, by reason of the fact that the treatment does not usually improve all the manifestations of the disorder, and even when it does so, it does not affect them equally. The case of thyroid medication, which completely eliminates all the manifestations of thyroid deficiency, is an unusual one in medicine. Even where the pathological process may be completely stopped, as in general paresis and pulmonary tuberculosis, the patient may be left with residual loss of function due to irrevocable loss of normal tissue. In some cases the treatment itself may be of such a nature that the patient merely exchanges one disability for another. For example, the treatment of mild diabetes mellitus by a reducing diet may indeed eliminate the diabetes, but only at the cost of replacing it by chronic hunger and social restrictions, which many patients feel are worse than the original disease. In the end, they may give up their treatment. In some cases, the treatment has “complications”, which means to the patient that he merely exchanges one set of symptoms for another. For example, he may exchange the symptoms of duodenal ulcer for those of dumping syndrome.