What are asthma triggers?

Asthma “triggers” are those things that make the airways tighten and become inflamed which leads to coughing, wheezing, and difficulty breathing. Sometimes a trigger brings on a reaction right away, but other times it may take several hours or days before symptoms begin. Here is information on several triggers.

Several triggers can cause worsening in asthma control. Continue reading for a look at the most common triggers, along with ways to reduce the risk they pose in worsening your asthma symptoms.

Last reviewed by a Cleveland Clinic medical professional on 04/27/2017.


  • Centers for Disease Control and Prevention. Common Asthma Triggers Accessed 5/18/2017.
  • American Lung Association. Reduce Asthma Triggers Accessed 5/18/2017.
  • American Academy of Pediatrics. Asthma Triggers Accessed 5/18/2017.
  • Barnes PJ. Chapter 254. Asthma. In: Longo DL, Fauci AS, Kasper DL, Hauser SL, Jameson J, Loscalzo J. eds. Harrison's Principles of Internal Medicine, 18e. New York, NY: McGraw-Hill; 2012. library.ccf.org Accessed 4/3/2014.

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