AJ PHOTO / SCIENCE PHOTO LIBRARY AJ PHOTO / SCIENCE PHOTO LIBRARY
Asthma attack. Young woman about to use an inhaler during an asthma attack. Asthma is a condition in which the small airways (bronchioles) in the lungs constrict, making it difficult to breathe. This causes wheezing, coughing and breathlessness, and can be dangerous. Asthma attacks can be brought on by exercise, allergic reactions and cold weather.
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