Appendicitis occurs when the appendix becomes blocked, often by stool, a foreign body, or cancer. Blockage may also occur from infection, since the appendix swells in response to any infection in the body.
A familial generation is a group of living beings constituting a single step in the line of descent from an ancestor. In developed nations the average familial generation length is in the high 20s and has even reached 30 years in some nations.
Generations are one way to group age cohorts. A generation typically refers to groups of people born over a 15-20 year span, such as the Millennial generation, currently the youngest adult generation. Generational analysis is an important tool used by Pew Research Center and other researchers.