GUSTOIMAGES / SCIENCE PHOTO LIBRARY GUSTOIMAGES / SCIENCE PHOTO LIBRARY
Childhood asthma. Parent helping their son use an inhaler during an asthma attack. He is one and a half years old. 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. The inhaler contains bronchodilator drugs, which widen the airways.
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