Activity-induced asthma: what to know

You may hear this called exercise-induced bronchoconstriction. It does not mean you must avoid physical activity; the aim is to find a plan that lets you exercise while keeping symptoms controlled.

Faster breathing during exercise brings more cool or dry air into the airways. In a sensitive airway, this can lead to temporary tightening and swelling. Asthma can present with wheezing, cough, chest tightness or unusual breathlessness during activity or shortly afterwards. Symptoms may be more noticeable with cold air, dust, pollen, pollution or a recent respiratory infection.

Breathlessness from exertion alone can feel similar, so the timing, triggers and response to treatment matter. A clinician may review your symptom pattern, listen to your chest and arrange breathing tests before and after medication or exercise when appropriate.

Begin with a gradual warm-up and increase intensity in stages. Choose a less polluted or less dusty setting when those exposures trigger symptoms, and consider a face covering in cold, dry air. Keep any prescribed reliever inhaler accessible and use it exactly as your clinician has advised. Check the inhaler technique and expiry date rather than waiting until symptoms start.

Pause activity if coughing, wheezing or tightness develops. Follow your personal asthma action plan. Frequent symptoms, night waking, reduced exercise tolerance or repeated reliance on a reliever can signal that background asthma control needs review.

Arrange a medical review if exercise repeatedly causes breathing symptoms, symptoms are becoming easier to trigger, or the prescribed plan is no longer working as expected. Assessment can separate airway narrowing from other causes of exertional breathlessness.

Seek urgent help for severe breathlessness, difficulty speaking in full sentences, blue or grey lips, faintness, confusion, marked chest tightness, or symptoms that keep worsening despite the prescribed reliever. Stop exercising and do not drive yourself if breathing is severely impaired.

Ask whether your pattern fits exercise-induced bronchoconstriction, whether breathing tests would help, and which inhaler should be used before or during activity. Also ask for a demonstration of inhaler technique, a written action plan, and advice about the sports or environmental triggers you encounter.