Aaron Allcorn thought a persistent head cold was causing his stuffy nose and snoring.

But after what was supposed to be routine nasal surgery, he learned his doctor had removed a large gray mass from his nasal passages.

Three weeks later, he got the biopsy results: his “head cold” was actually diffuse large B-cell lymphoma.

“When the doctor told me I had lymphoma, I really didn’t know what that meant until he said...