Today I woke to two kids with a fever, one of them throwing up with the other dripping yellow goo. And the third has mono (who now also has this mystery crud on top of that!). Then it occurred to me; Can my paranormal hero get sick? The answer? Why not? Illness mutates. It’s a living growing thing that can cross species. This we know from swine flu and avian flu. So, why not vampires, werewolves, or witches?
But what if you’re not writing about a vulnerable creature? What if it’s a ghost? Or an angel? The general consensus is that these are temporal creatures, so maybe you can give them symptoms that are a direct reaction to an event unseen. Like a tear in space, a black hole forming, or two planes of existence crossing. You can have their reaction cancel out any number of their cool abilities, or just knock them out all together.
Throwing in another hurdle for your hero/heroine to overcome is always a fun thing to work with. And it drives us readers crazy, which we love. The mystery of an illness and how they’ll overcome it is something we can all relate to. So break out that medical encyclopedia of strange and rare illnesses and have fun inflicting your protagonist!
Shelley Martin Fiction 
My psychics get a little sick if they have “psychic overload.” My vamps are usually healthy unless starved for blood or sunburned…and I think my sorcerers get colds like the rest of us. Awesome post! You’ve given me a lot to think about. I hope your little guys get better soon. 🙂
I’d like to think an angel being sick is like us being down. And us being sick is justa temporal thing 🙂