Psychiatry is a part of medicine that studies, diagnoses and treats mental illnesses and abnormal behaviours and conditions that cause problems and make life difficult for people. The people who practice psychiatry and treat others who have psychiatric problems are called psychiatrists.
People who specialize in psychiatry often differ from most other mental health professionals and physicians in that they must be familiar with both the social and biological sciences. The discipline studies the operations of different organs and body systems as classified by the patient's subjective experiences and the objective physiology of the patient. Psychiatry treats mental disorders, which are conventionally divided into three very general categories: mental illnesses, severe learning disabilities, and personality disorders.