The exact cause of appendicitis is not fully understood, but it is believed to be caused by a blockage in the appendix. The blockage can be due to a variety of factors such as
The buildup of thick mucus
A stool
Foreign body in the appendix
An infection
When the appendix is blocked, the bacteria inside begin to multiply and cause inflammation, leading to appendicitis. In some cases, appendicitis may also be caused by an infection that spreads to the appendix from another area of the body.