If someone got bulmos [a sickness of hunger], we give him food, even treif food, until he feels better.

Whoever was bitten by a mad dog, may still not eat a liver lobe [some thought it helped]. R’ Masya ben Charash says he can.

R’ Masya ben Charash says if you have a sickness in your gums, since in can spread, you can desecrate Shabbos to save yourself.

Yuma 8:7

If a building collapses and there may be somebody alive under the rubble, since it might be a Jew , you must clean away the ruble to save the person.