Understanding asthma

What happens in asthma

Asthma is a long-term condition of the airways, the tubes that carry air in and out of the lungs. In asthma the airways are inflamed and twitchy: they react strongly to things like dust, pollen, smoke, cold air, exercise or infections. During a flare the airway walls swell, produce extra mucus and tighten, which narrows the passage air moves through.

The result is wheezing, coughing, chest tightness and shortness of breath, often worse at night or early morning. Symptoms come and go - many people are completely well between flares.

Why it matters

Asthma is one of the most common long-term conditions in children and adults worldwide. Most people with asthma live full, active lives when it is controlled, but severe flares can be dangerous and need urgent care.

Because symptoms vary, asthma is sometimes under-recognized: a recurring night cough or breathlessness with exercise can be asthma even without dramatic attacks.

How it is managed

Management rests on two ideas. Preventer medicines, usually inhaled corticosteroids taken regularly, calm the underlying airway inflammation and reduce flares. Reliever inhalers quickly relax tightened airways when symptoms strike. Using a preventer daily, even when feeling well, is what keeps the condition quiet; relievers alone do not control it.

Knowing and avoiding personal triggers, having a written plan for worsening symptoms, and reviewing inhaler technique with a clinician all make a measurable difference. Medicines and plans are individual and set with the treating clinician.

What this overview cannot do

This is general information, not clinical guidance for any one person. It cannot say whether someone's symptoms are asthma, which inhaler they need, or what to do in an attack. Those decisions belong with a qualified clinician, and severe breathing difficulty is an emergency.