One reason lung cancer has been so hard to fight is that there is no early detection method as simple as a mammogram or the PSA for prostate. Often there are no symptoms until it metastasized to another organ.

Mine was not found till stage 4. That was 2010, so 14+ years ago.

This is for a list of questions to ask the oncologist about dealing with lung cancer from diagnosis to survivorship. It's on the American Cancer Society Website.
https://www.cancer.org/cancer/types/lung-cancer/detection-diagnosis-staging/talking-with-doctor.html