Could these be lung cancer symptoms?

My sister has been complaining of chest pain as well as shoulder and arm pain. Recently she had an unusual situation where half of her face became swollen. Her Dr. keeps telling her it's stress. She also had some routine blood work done a few weeks ago. We have a strong family history of cancer. I noticed these symptoms could also be a sign of lung cancer. She has never been a smoker but has a history of chronic bronchitis. Both parents were heavy smokers. Do you think there is anything else her Dr. should be looking into? Her blood work came back normal. Thank you in advance.