Most airplanes don't havea checklist for PAX fainting or getting sick.
When we had a sick FA we almost diverted to the British Isles instead of crossing the Atlantic.
Sometimes stuff happens that is not a "planned"emergency/situation. For example, I just had a situation where the autopilot shut off and we lost LNAV/VNAV. There were no ACARS messages to indicate what led to this, and no checklist to follow. Our FMCs had reverted to pre-flight status, with nothing in their memories. After we fixed this, it happened again 20" later.
We had 2 senior captains and an engineer in the cockpit, and none of then knew why this was happening. They didn't know what to right up in the logbook, exactly. We had to figure out how to fix it on our own...no checklists or procedures to help us.