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Lung Cancer vs. Pneumonia: What Are the Differences? Topic Guide

Lung Cancer vs. Pneumonia Lung Cancer vs. Pneumonia : Lung cancer occurs when healthy cells in lung tissue become abnormal and then multiply causing cancerous (malignant) tumors in the lung(s). Pneumonia is a bacterial, viral, or rarely, a fungal infection in the lung(s). The most common, similar signs and symptoms of lung cancer and pneumonia are cough, chest pain or discomfort, and shortness of breath. Both lung diseases also can cause signs and symptoms like coughing up blood, wheezing, pleural effusion, and lethargy.

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