Something that causes and asthma attack. Many things trigger an asthma attack. Triggers include allergies, infections, irritants in the air, cold dry air and changes in the weather, exercise, hormone changes, as well as fatigue. Common triggers include cats, dogs, dust, dust mites and pollen. (none) (none)
A stimulus that causes asthma symptoms or an attack. Triggers include irritants such as fumes, cigarette smoke, allergens such as house dust mite or moulds, viral respiratory tract infections, and exercise. Not every asthmatic responds to every trigger. And not every asthmatic responds to the same trigger in the same way on each exposure. Some triggers, such as allergens, can cause worsening airway inflammation.
Anything that causes asthma symptoms to worsen in a given person. Different things are triggers for different people. Common triggers include exercise, cigarette smoke, pollen, dust, cold air, and aspirin/NSAIDs. Upper respiratory infections are perhaps the most common trigger for asthma symptoms.