Irritants
Asthma triggers include irritants such as:
tobacco smoke
viral upper respiratory infections
environmental pollutants such as smog or vehicle fumes
indoor irritants such as perfumes, detergents, and paints
exercise
work-related exposure to chemicals, dusts, and gases
drugs such as aspirin or NSAIDs (nonsteroidal anti-inflammatory drugs), and beta-blockers
GERD (gastroesophageal reflux disorder)