Hi, It happened during my vacation which take 16hours non stop flight . Immediately, next day in morning , i notice my throat feel very dry and when brushing teeth and tongue and notice that there are trace of blood from my throat ( i confirmed is not from my gum) . Has been a month from now . Had seen the ENT , everything was fined , i don't have sore throat or cough .... Just dont understand where this bleeding is from. Did anyone know what happen?