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