Variety of causes: Asthma flare up can be caused by a variety of things: viruses (probably the most common); non compliance with medications; exposure to allergens; exercise and cold air.
Answered 3/27/2015
5.7k views
Many things: There are many triggers of asthma which include: viral illnesses, allergies, exercise, foods, pollution, etc.
Answered 7/18/2013
5.7k views
4 doctors weighed in across 2 answers
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