Hi, I have just come out of hospital, yesterday after spending christmas alone on a ward, I was taken into a nd e, christmas eve, as I had been coughing up blood for 5hrs non stop, I do not have a cold,or sore throat, no headaches, chest pains, I do not drink alcohol. but I do smoke, not many just 7 a day.. no excuse I know, I have been smoking for 45yrs, and I am 55yrs old, I am determined to give up smoking and not had a cigarette since that frightening experience, The hospital failed to come up with an answer why,or where it came from. blood tests came back normal, I never had a temprature the whole time, no fever either. no sweats. nothing, just coughing up blood, which stopped on its own accord christmas day about 11am.im coughing normally and just 2/times singularly a day with very light grey sputum, breathing is normal,in fact I can take deep breathes without coughing atall. is this normal behaviour, and should I consider having further investigation to see if I have lung cancer, I am worried sick, but either way I shall never smoke again. thankyou for a wonderful site, and your time.