The tumor may produce hormone-like substances that spread to the body and cause symptoms of carcinoid syndrome, such as flushing of the face and chest, diarrhea, and trouble breathing. People with a lung carcinoid tumor are less likely to have carcinoid syndrome , but may experience coughing, wheezing, or pneumonia. [2]
https://rarediseases.info.nih.gov/diseases/9316/carcinoid-tumor

