[Well, he supposed he could humor questions on the matter, one could not learn if they did not ask… but also he’s been up for far too long, and was still determined to get medicine in her with as little a fight as possible.]

When you are ill your body produces various fluids to fight or block the illness, hence why your nose runs. Some of that fluid winds up in your sinuses, and if it does not drain properly it can grow infected.

Surly you have seen infected injuries, yes? Now imagine happening inside your head. Do you understand how it swells now?

[No doubt she’s seen her share of grizzly war wounds, and the fetid aftermath of such wounds left poorly treated. Hopefully that would make for enough vivid imagery to answer her question.]