1. A Persistent Cough
This symptom is what most people relate to lung cancer, says Dr. Shu. “If you have a chronic cough, such as a smoker’s cough, and certainly, if you cough up blood or phlegm that’s in any way reddish or pink, see your doctor,” she says.
Most of the time a cough is happening for understandable reasons, such as a cold, says Dr. Pennell. It’s when it doesn’t ease up that you should snap to attention. “The average time a cough lasts after a virus is three weeks,” he explains. Hacking away for much longer than that? You know what to do.