Triggers

Exposure to various allergens and irritants can initiate the symptoms of asthma and lead to attacks.

Allergens

• Animal dander (feathers and fur)
• Dust and dust mites
• Cockroaches and mice
• Pollen, mold and mildew

Irritants

• Cigarette smoke
• Air pollution
• Cold weather
• Strong odors, scented products or chemicals, such as perfumes
• Stress and strong emotions, or a high level of anxiety

Others

• Exercise
• Viral infections, such as the common cold
• Medicines, such as aspirin and beta-blockers (used for high blood pressure)
• Sulfites used in foods and wines
• Gastroesophageal reflux disease or GERD
  (a condition in which acids in the stomach back up into the esophagus, causing heartburn)