It's theorized that the fungus (which was everywhere in buildings I spent time in) created ulcers or disrupted ulcers, allowing the underlying cause to take hold.

Re: Gastrointestinal aspergillosis

The reason I asked is I knew someone who got lung cancer and died (a long time ago) and the oncologist said it was bc of the black mold on the walls in their room. I was wondering if the ill effects extended to colon cancer.