Can lung cancer be asymptomatic?

Yes: Early on lung cancer can be completely asymptomatic. In fact early tumors may be found incidentally on chest xrays or ct scans.

Yes: Lung cancers start off very small and might not be discovered in regards to symptoms untill very large.

Yes: Lung caner is most commonly diagnosed as advanced disease (stage iii or iv) because it is often asymptomatic untill late. New data from the national lung screening trial, suggests that for high risk patients (heavy current or former smokers, age 55-74) lung cancer screening with low dose chest ct may reduce death from lung cancer.

Unfortunately YES: Unfortunately, early lung cancer is often asymptomatic. The following link may assist you in the possible symptoms: http://goo.Gl/vvhhy.

Unfortunately: That's why most lung cancers are caught so late...there are no symptoms until they are large and have already spread.