How is your sense of humor on a normal day? This is a serious question. Do you keep your sense of humor? Do you have a sense of humor? If you don't have a sense of humor, I think it would negatively impact your health issues.
Yes I have no training on any kind of medical or psychological information. But I do think a healthy sense of humor is very important as a coping mechanism. If you can crack jokes, you probably are not on death's door.... right now.
Personally, I think sense of humor should be checked, just like any other vital sign, at doctor appointments.