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Asthma. Man suffering from bronchial asthma leans against a wall to regain his breath. He is holding an inhaler. Asthma causes attacks of breathlessness and wheezing due to narrowing of the airways in the lungs. An attack can be triggered by stimuli including house dust and air pollutants. The inhaler releases a bronchodilator drug that relieves asthma by relaxing and widening the airways.
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