User blog comment:ImperiexSeed/Supernatural Mysteries/@comment-3481504-20120408022053

How is "ghost sickness" actual sickness? I mean, the way Sam described it, was like a disease.

It's shown in "Yellow Fever" to only induce paranoia, anxiety, and hallucinations. Now how is disease? Like Pestilence couldn't do that, so it therefore has nothing to do with actual sickness.