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By Mayo Clinic staffIt isn't clear why some people get asthma and others don't, but it's probably due to a combination of environmental and genetic (inherited) factors.
Asthma triggers are different from person to person. Exposure to various allergens and irritants can trigger signs and symptoms of asthma, including:
- Airborne allergens, such as pollen, animal dander, mold, cockroaches and dust mites
- Respiratory infections, such as the common cold
- Physical activity (exercise-induced asthma)
- Cold air
- Air pollutants and irritants such as smoke
- Certain medications, including beta blockers, aspirin and other nonsteroidal anti-inflammatory drugs
- Strong emotions and stress
- Sulfites, preservatives added to some perishable foods
- Gastroesophageal reflux disease (GERD), a condition in which stomach acids back up into your throat
- Menstrual cycle in some women
- Allergic reactions to foods such as peanuts or shellfish