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There's a concept in maintenance management: The idea is that every time you do maintenance, there's a chance you take something that works and turn it into something that doesn't work. It's contrary to the idea of "doing something" for the sake of itself, because if you're not reducing the risk then you're going to cause the thing you want to prevent. Because of that, proper maintenance management says that you do exactly the amount of maintenance you need to, and not one bit more.

This concept I believe does extend to medicine as well. Every time you do something as a doctor, there's a chance it makes things worse. That goes with surgeries, as well as various prophylactic treatments. You have to be very careful when you're mitigating risk that you actually are mitigating risk. It's very easy to say "We have to DO something!" and in doing something you cause more harm than you would have by doing nothing.