Is pneuomonia a symptom of lung cancer?

Sometimes: Some lung cancers cause obstruction of the air passage with atelectasis=collapse and pneumonia as a result. If pneumonia does not resolve with usual treatment, ct scan and followup ct may be indicated to uncover a sneaky cancer.

Lung cancer : Can arise in a bronchus, block it, cause pneumonia that either does not clear, or clears slowly. Thereby, indicating need for a bronchoscopy. A pneumonia may also not clear if treated with the wrong antibiotic for the causative agent of the pneumonia.

See below: Pneumonia can happen in the setting of underlying cancer. But not all pneumonia is related to cancer. Often becomes hard to identify cancer on scans with pneumonia; you will need follow up scans after the pneumonia resolves to see if a biopsy is required;.