functional neurological disorder causes
Functional Neurological Disorders (FNDâs). Functional Neurological Disorders (FND's) is the name given for symptoms in the body which appear to be caused by problems in the nervous system but which are not caused by a physical neurological disease or disorder.hen patients first tell a clinician about their symptoms, such serious neurological diseases are often mentioned as possible diagnoses. However, when investigations such as scans are done to check for these diseases, there are no indications that there is any neurological disease or damage in the nervous system.