19.2 Global Health

By the end of this section, you should be able to:

• Define social epidemiology
• Apply theories of social epidemiology to an understanding of global health issues
• Differentiate high-income and low-income nations

Social epidemiology is the study of the causes and distribution of diseases. Social epidemiology can reveal how social problems are connected to the health of different populations. These epidemiological studies show that the health problems of high-income nations differ from those of low-income nations, but also that diseases and their diagnosis are changing. Cardiovascular disease, for example, is now the both most prevalent disease and the disease most likely to be fatal in lower-income countries. And globally, 70 percent of cardiovascular disease cases and deaths are due to modifiable risks (Dagenais 2019).

Some theorists differentiate among three types of countries: core nations, semi-peripheral nations, and peripheral nations. Core nations are those that we think of as highly developed or industrialized, semi-peripheral nations are those that are often called developing or newly industrialized, and peripheral nations are those that are relatively undeveloped. While the most pervasive issue in the U.S. healthcare system is affordable access to healthcare, other core countries have different issues, and semi-peripheral and peripheral nations are faced with a host of additional concerns. Reviewing the status of global health offers insight into the various ways that politics and wealth shape access to healthcare, and it shows which populations are most affected by health disparities.