every medical intervention has a variety of unexpected conseguences, most of them bad, some of them neutral, pretty noone good.
So I'd consider to intervent medically on my body if I'm able to identify a clear bad expected conseguence in the not-intervention and a clear good expected conseguence in the intervention.
In this way, whatever would be the unexpected conseguences of intervention, there's a lot of chances they wouldnt be worse than the expected conseguences of not-intervention.
This also prescribe a simple euristic to act in every condition of information: if you cant strogly identify expected benefit/malus dont act.
The opposite of modern world psychosis of taking pills for all little diseases (and even when there no disease but strong social/media pressure).