The word 'psychiatry' is derived from the Greek for "doctor of the soul" and was first coined in the early 19th century by the German physician and anatomist, Johann Reil (1759-1813), although the treatment of mental disturbances dates back hundreds of years prior to this. The specialty of Psychiatry is regarded as dealing with the prevention, assessment, diagnosis, treatment, and rehabilitation of ‘mind’ illnesses or mental disorders. Diseases of the brain itself, for example encephalitis, tumours, and so forth, fall within the realm of neurology, generally. There are, of course, many overlapping disorders which cause neurological symptoms (paresis, slurred speech, ataxia, to cite a few) and ‘mind’ symptoms (depression, anxiety, psychosis). Disorders which affect several organ systems, for example, the autoimmune diseases, often cause multiple, bewildering neurological and mental symptoms. The primary goal of the psychiatrist is relief of suffering associated with ‘psychiatric’ disorders which include inappropriate anxiety, clinical depression, and psychotic disorders. Attempts have also been made to categorize and ‘treat’ different types of personality disorder. The latter is a contentious issue (perhaps with the exception of antisocial and borderline types) sometimes based on value judgments rather than clear scientific evidence. Treatment for mental health problems nowadays is usually community-orientated for less severe conditions and often hospital-based for more intractable disorders. The vast majority of patients are treated on a voluntary basis, whether in hospital or the community.