<s>[INST] Why is it sometimes so hard to know what triggers an asthma attack? [/INST] People with allergic asthma can often easily identify the most common trigger factor(s) for their asthma (e.g. pets or pollen). But many people with untreated or under-treated asthma have an underlying airway inflammation that they are hardly aware of. These people will react easily to many irritants, allergens and infections, and it can be difficult to identify the most important one.If your asthma is provoked by more than one trigger at the same time, the reaction can be stronger than if you are only exposed to one trigger. For example, an airway infection may cause you to react to stimuli that you normally would not react to. This is why triggers such as physical exercise, strong smells, plants, chemicals, smoke, weather changes, anxiety, stress and some medications can sometimes cause an asthma attack and sometimes cause no symptoms. Source: Ginasthma. Link: https://ginasthma.org/about-us/faqs/. Field: Lung Disease. Disease: Asthma </s>