How do I comfort a scared patient when I only know the facts?

You can state the facts clearly, and that matters. But facts are not what a frightened patient or family is reaching for in that moment. They want someone to hold the fear with them, and when that is asked of you, you freeze. That is because holding a moment feels like it has no clear method. It does have one, and it is simpler than the medicine. You do not need the perfect words. You need to slow down, look at them, and let the feeling be there without rushing past it. Presence, not eloquence, is what holds a moment. You already have everything required. Next time the fear fills the room, put the chart down and say something small and true, like, I know this is frightening, I am here with you. Then pause. You do not have to say more. That one sentence and your staying tells them they are not alone, which is what they were really asking for.