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1. Airborne allergens, such as pollen, dust mites, mold spores, pet dander, or particles of cockroach waste.
2. Respiratory infections, such as the common cold.
3. Physical activity.
4. Cold air.
5. Air pollutants and irritants, such as smoke.
6. Certain medications, including beta blockers, aspirin, and nonsteroidal anti-inflammatory drugs, such as ibuprofen and naproxen sodium.
7. Strong emotions and stress.
8. Sulfites and preservatives are added to some types of foods and beverages, including shrimp, dried fruit, processed potatoes, beer, and wine.
9. Gastroesophageal reflux disease (GERD), a condition in which stomach acids back up into your throat
10. Having a blood relative with asthma, such as a parent or sibling.
11. Having another allergic condition, such as atopic dermatitis — which causes red, itchy skin — or hay fever — which causes a runny nose, congestion, and itchy eyes.
12. Being overweight.
13. Being a smoker.
14. Exposure to secondhand smoke.
15. Exposure to exhaust fumes or other types of pollution.
16. Exposure to occupational triggers, such as chemicals used in farming, hairdressing, and manufacturing