Medical sociology and anthropology are concerned with the social and cultural factors that influence health, illness, and medical systems. Medical sociology examines medicine as a social institution and applied enterprise, and how social factors relate to illness and medical treatment. Medical anthropology takes a cross-cultural perspective to study traditional and modern medical systems, and how biological and socio-cultural characteristics of groups influence health and disease. Both fields look at how social groups experience illness and how societies define, treat, and support responses to disease.