I notice I experience more full body shivers when I'm sick, and it's not the shivers from being cold. I'll be completely warm and comfortable then I feel this electric tingling sensation that starts with my feet then it shoots up and throughout my entire body. I've learned this is a Kundalini experience...
I can't tell if getting sick is giving me more growth per-se, but before I awakened I was beginning to feel better then I completely relapsed. The Universe has a funny way of saying "Hey! Pay attention to this! This is what you need to work on!" and manifests as physical illness...or something.