The investigation of test persons with asserted physical discomfort lacking objectifiable causes or at least without adequate organic correlative confronts all participants with considerable problems. It involves showing an appreciation for the affected person's discomfort while at the same time seeking to ascertain the true picture of the complaint. It is also necessary to reject unjustified requests for care while giving appropriate consideration to specific features of the complaint. This is particularly difficult in such cases, as the situation is invariably blurred, frequently as a result of the interaction between expert and test person.