Asthma may be triggered or worsened by various factors, including:
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Allergens (e.g., pollen, dust mites, pet dander)
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Respiratory infections (e.g., colds and flu)
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Irritants (e.g., smoke, air pollution, strong odors)
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Exercise (exercise-induced bronchoconstriction)
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Stress and strong emotions
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Exposure to cold air
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Occupational exposures (e.g., workplace chemicals or allergens)