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Asthma Triggers

Asthma Triggers

Topic Overview

An asthma trigger is a factor that can lead to sudden difficulty breathing or other symptoms of asthma (asthma attack).

Some triggers are substances a person may be allergic to (allergens). Allergens cause the body's natural defenses (immune system) to produce chemicals called immunoglobulin E (IgE) antibodies. These chemicals bind to allergens, causing inflammation of the bronchial tubes, which carry air to the lungs. The allergen may also cause asthma attacks. These triggers include:

Other triggers can cause asthma symptoms without affecting the body's immune system. These include:

  • Cigarette smoke and air pollution.
  • Viral infections, such as colds and influenza, and sinus and other upper respiratory infections.
  • Exercise. Many people with asthma have symptoms when they exercise.
  • Dry, cold air.
  • Medicines, such as aspirin or beta-blockers.
  • In adults, hormones, including those involved in pregnancy and menstrual periods (just before or during periods).
  • Gastrointestinal reflux disease (GERD) . Some experts debate whether GERD makes asthma worse. Studies have shown conflicting results as to whether GERD triggers asthma.1

References

Citations

  1. Gibson PG, et al. (2003). Gastro-esophageal reflux treatment for asthma in adults and children. Cochrane Database of Systematic Reviews (1). Oxford: Update Software.

Credits

By Healthwise Staff
John Pope, MD - Pediatrics
Lora J. Stewart, MD - Allergy and Immunology
Last Revised March 14, 2013

Last Revised: March 14, 2013

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