asthma

This term describes a specific medical pathology of the respiratory system, evoking a sense of constriction and urgent struggle for air. It is used primarily in clinical settings or personal health discussions to denote a chronic state of hypersensitivity in the bronchial tubes.

As a mass noun, it refers to the condition as a whole rather than individual instances of the disease. While one can experience an asthma attack, the disease itself is treated as an uncountable entity in standard English usage.