Hello I am 21yo male and was having cough from few days with sneezing I took medicine sneezing went away but cough didn't. Yesterday at 4am i woke up and spitted red thing in blood. I at first thought panicked and thought it is blood. And went to my ENT  doctor straight away in morning. He said you coughed very forcefully that's why you got blood. He said your chest is not blocked. He checked it with stethoscope. But when I came home I realized that i ate manchurian of red color right before sleeping. And when I spitted at late night after one second only I spitted again there was no red thing then. Means at first spit there was red thing and very next second the spit was clear. And in morning also nothing like that happened. Can it be that Manchurian redness only? My doctor says your chest is not blocked.