A comment heard from several friends: "Why save for retirement? One large medical expense can wipe out years of savings. You're better off enjoying life and spending what you earn while you can."
Parent poster is commenting on the general expense of medicine, but for your typical retiree, it shouldn't be too out of control with Medicare.
Edit - sibling poster pointed out that personal savings in approved retirement savings plans/schemes would not be put at risk for medical debts, which makes sense. The problem however with the folks described in this story is that a substantial amount of people _don't_ actually do this - they either have not saved anything, or their savings were in other forms (real estate, etc) which have been eroded/lost.
Your medical expenses should be a part of your retirement savings.