You had pretty fucked up joints due to a condition you were born with causing your joints to be more flexible and more prone to dislocating and getting injured

You were laying in your bed, unable to move as your hip was out of place. You were late for training and everyone was getting curious as to where you were.

Zenitsu walked into the room

"Alice? You okay? You're late for training "

He assumed you were sick because of how you were laid