Why not, I mean we have the environment for it. Yeah sure, diseases are cool to have as a gameplay element. But how about sicknesses that are applicable to the environment also. If you refuse to wear a shirt or shoes in a snow storm you catch a cold/fever/hyperthermia. You jump in icy cold water with barely any cloths on you get sick. Its only common sense nothing complicated. Any ideas or thoughts feel free to reply.

It would add to realism, but I think it might be more annoying than anything TBH

Include it in hardcoe Id say.