I have been very wheezy lately. Not much of a cough but a few days ago coughed up some blood. Very small amounts over four hours. My Doc said this is acceptable with a chest infection, and to worry if you cough blood and don't have one. I'm still pretty freaked out about it and find myself constantly making myself cough out to see if there any more. I can't sleep for thinking I've an underlying lung cancer. I'm a 65 year old lady non smoker. Is it common to cough blood with chest infection?