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Asthma
Make it clearer
Asthma usually involves long-term inflammation of the airways, the tubes air travels through as you breathe in and out. Long-term here means that the inflammation is part of how the disease runs, not a one-time event. That is why it does not look the same from day to day: symptoms vary in timing and in intensity, and so does expiratory flow, the air that moves out while you exhale.
When an asthma attack hits, the airway narrows in two ways at once. One is the inflammation; the other is the muscle wrapped around the tube tightening. It is like a hose that is getting narrower on the inside while a hand squeezes it from the outside, both happening at the same moment to the same tube.
In brief
Asthma is usually characterized by chronic inflammation of the airways. Chronic means that the inflammation remains part of the disease over time.
Symptoms vary over time and in intensity, as does expiratory airflow, the air that moves out when you exhale.
During an asthma attack, two processes narrow the airway at the same time: inflammation and contraction of the muscle around the airway.
The inflamed wall takes up more room while muscle tightens around the same airway.
Sources (3)
- Global Initiative for AsthmaGlobal Strategy for Asthma Management and Prevention, 2026Published
- National Heart, Lung, and Blood InstituteExpert Panel Report 3: Guidelines for the Diagnosis and Management of AsthmaPublished
- National Heart, Lung, and Blood InstituteWhat is Asthma?Published
This page explains the topic in general terms; it does not tell anyone what treatment to follow.
Updated