I'm 18 yrs old and yesterday I had a cough attack from choking on food and I went to my bathroom and started coughing up phlegm really hard but on two occasions I coughed up phlegm that had a streak of blood in it. I can't afford a doctor right now is this a symptom of lung cancer or is it because I was coughing very hard I don't know but I don't want to die :(
Lung cancer at your age is VERY rare indeed. If you don't have a persistent cough, blood every time you cough, persistent shortness of breath, pains when breathing or sudden weight loss, then forget about it. If this happened after choking on food, then the food obviously temporarily damaged the food/wind pipe and will quickly heal up again.
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