Psychiatry is the medical specialty devoted to the study and treatment of mental disorders. These mental disorders include various affective, behavioural, cognitive and perceptual abnormalities. The term was first coined by the German physicianJohann Christian Reil in 1808, and literally means the ‘medical treatment of the soul’ ( psych-: soul; from Ancient Greek psykhē: soul; -iatry: medical treatment; from Gk. iātrikos: medical, iāsthai: to heal). A medical doctor specializing in psychiatry is a psychiatrist.