Constant Coughing –
For those that do not smoke, a persistent, constant cough is almost never cancer, as they usually go away after 3 to 4 weeks. However, if your cough does not go away, and it is accompanied by shortness of breath or coughing up blood, then visit a doctor right away. This is even more important to those that do smoke, since these are common symptoms of lung cancer. By testing the mucus from your lungs, doctors can quickly determine if you have an infection or serious problems.