- Before 1700s
- 1700s
-
1800s
-
1900s
- Early 1900s
- 1930s
- 1940s
- 1950s
- 1960s
- 1970s
- 1980s
- 1990s
- 2000s
From Jamie Berke, former About.com Guide
Updated April 11, 2010
About.com Health's Disease and Condition content is reviewed by our Medical Review Board
1800s