What describes lung cancer?

Lung cancer is characterized by the presence of a malignant tumor that originates in the lung tissue. This condition arises when cells in the lungs start to grow uncontrollably, leading to the formation of tumors that can be life-threatening. Typically, lung cancer may develop from the cells lining the airways and can be classified into different types based on the specific characteristics of the tumor cells.

The description of lung cancer emphasizes its malignant nature, which distinguishes it from benign growths or other types of lung conditions, such as infections or non-cancerous tumors. The other options present scenarios that do not capture the essence of lung cancer. For instance, a rapid increase in lung capacity does not occur with lung cancer; rather, lung function typically deteriorates. Additionally, a viral infection would imply an acute illness rather than a chronic malignancy, and non-cancerous growths would not be classified as lung cancer at all. This understanding is critical for identifying and addressing the serious health implications associated with lung cancer.