The following information may help to address your question:
The natural history of IPF is not completely understood. While it usually follows a course of progressive deterioration, some people remain stable for extended periods and individual outcomes can vary significantly. Still, long-term survival of IPF is not expected.
It now appears that three potential disease courses exist, but there is not currently a definitive way to predict the course in an affected person. They are:
a) slowly progressive disease (the most common);
b) disease marked by episodes of acute exacerbations; and
c) rapidly progressive disease.