What Causes a Hiatus Hernia?
In some people, the hiatus or hole in the diaphragm weakens and enlarges. It is not known why this occurs. It may be due to heredity, while in others it may be caused by obesity, exercises such as weightlifting, or straining at stool. Whatever the cause, a portion of the stomach herniates, or moves up, into the chest cavity through this enlarged hole. A hiatus hernia is now present. Hiatus hernias are very common, occuring in up to 60 percent of people by age 60.
