But I have Crohn's disease and COPD emphysema, pulmonary fibrosis. And I also have Crohn's disease in my intestinal tract. All my digestive system is affected entirely. It can cause many extra intestinal manifestations as well. Coincidentally, Crohn's can cause lung disease, but it was born at 24 weeks gestation in 1975. One pound 11oz. I was just reading up on one of the medications they want to give me for my lungs, and it does indeed trigger Crohn's