so i'd imagine that first order kids are trained to ignore illness and push through it because its weakness and wastes time etc, etc and that goes triple for hux because of his dad and because he's such a high ranking general

so, naturally, when he starts to feel sick he ignores it, takes some space medicine and gets on with his day but eventually he starts to feel worse to the point where every one around him can see it

its kylo showing concern that finally gets hux to realise hes probably worse off than he thinks

up to anon whether its serious or like man flu or something i just wanna see kylo reluctantly feeding hux chicken soup or whatever

bonus if hux passes out during one of his big teary speeches about genocide and stuff