Asthma Rates in America: Causes and Risk Factors

Key Factors Driving Asthma Prevalence

1. Genetic predisposition – Family history increases susceptibility.
2. Environmental triggers – Allergens (pollen, dust mites, pet dander, mold), air pollution (particulates, ozone), respiratory infections, stress.
3. Hygiene hypothesis – Reduced early microbial exposure may impair immune development, raising allergy/asthma risk.
4. Obesity – Increases inflammation and worsens symptoms.
5. Lifestyle factors – Smoking, secondhand smoke, physical inactivity.
6. Socioeconomic factors – Limited healthcare access, poor housing (dampness, allergens).
7. Climate change – Warmer temperatures, longer pollen seasons exacerbate asthma.