The Rebbe explains that pikuach nefesh refers solely to preserving life, not to suffering, as shown in Yoma 85a. He clarifies his note on Rambam, that “ways of Hashem” means maintaining health to serve Hashem, not imitating His attributes, and corrects a textual point in Shulchan Aruch.
https://www.torahrecordings.com/rebbe/igroskodesh/016/002/5839