Asthma is a chronic inflammatory disease of the airways. Inflammation makes the airways more sensitive to triggers — and when triggered, the muscles around the airways tighten and the lining swells, narrowing the path that air has to travel through.
Asthma affects roughly 25 million Americans including 5 million children. The disease ranges from mild and intermittent — a few episodes a year that respond instantly to a rescue inhaler — to severe and persistent, requiring biologic therapy and emergency department visits.
The relationship is dose-responsive: patients who take their ICS less than half the time prescribed have roughly twice the exacerbation rate of patients who take it consistently. The single most actionable visualization in asthma — the medication you can't feel working is the one keeping you out of the hospital.
Asthma is a chronic inflammatory disease of the airways. Inflammation makes the airways more sensitive to triggers — allergens, cold air, exercise, viral infections, smoke — and when triggered, the muscles around the airways tighten and the airway lining swells, narrowing the path that air has to travel through. The result is wheezing, coughing, chest tightness, and shortness of breath.
The classic four symptoms are wheezing, coughing, chest tightness, and shortness of breath. They often worsen at night and early morning, after exercise, during viral illnesses, or with exposure to specific triggers. Many patients have asthma for years without realizing it — they treat their symptoms as "just my cough" or "I'm just out of shape."
Diagnosis combines history, physical exam, and pulmonary function testing (PFT). The single most important test is spirometry with bronchodilator response: we measure how much air you can blow out in one second (FEV1), give you a rescue inhaler, wait 15 minutes, and re-measure. A meaningful improvement after the inhaler confirms reversible airway obstruction — the signature of asthma. For some patients, methacholine challenge testing (a controlled exposure to a substance that constricts airways) confirms airway hyperreactivity when spirometry alone is inconclusive.
Modern asthma care is built around inhaled corticosteroids (ICS) as the foundation. ICS taken daily reduces airway inflammation, which prevents the underlying disease from flaring. For most patients, ICS combined with a long-acting bronchodilator (ICS-LABA) in a single inhaler — used both daily and as needed for symptoms — is the current standard of care, replacing the older rescue-inhaler-only approach for all but the mildest asthma. For severe asthma, biologic therapies (mepolizumab, benralizumab, dupilumab, tezepelumab) target the specific inflammatory pathway driving each patient's disease. These have transformed outcomes for patients who used to live with weekly attacks.
This page is general medical information, not personalized medical advice. If you have questions about your specific health, talk with your Nimbus clinician.
