It’s gotten especially bad in the past few years. I had a minor health scare recently and found it incredibly difficult to find relevant search results given hundreds of different queries describing my condition.
The amount of health-related blogspam on Google is criminal, IMO. I've come across dozens of sites soliciting health advice, treatments, and "cures" that were not only not approved by the FDA, but weren't written, approved or edited by medical doctors at all.
There are going to be sick or desperate people who follow that advice, or attempt to use those "cures", and some of them will be harmed because of it.