CORDELIA MOLLOY / SCIENCE PHOTO LIBRARY CORDELIA MOLLOY / SCIENCE PHOTO LIBRARY
Asthma relief. Close-up of a young man using an inhaler to control an asthma attack. Asthma attacks vary in severity from breathlessness, dry cough, wheezing, or a feeling of chest tightness. All symptoms are caused by narrowing of the bronchioles in the lungs and triggered by a variety of stimuli including infection, exertion, emotional stress, and allergens such as pollen and dust. Inhalers contain bronchodilator drugs (which widen the airways) and/or steroids (which reduce inflammation). When using an inhaler relief is usually rapid.
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