What causes asthma ?

While the exact cause of asthma remains undiscovered, it is likely that both genetic and environmental factors have a role. Possible causes of asthma include:
  • Exposure to chemicals called cytokines while in the womb [3]
  • Exposure to allergens while in the womb [3]
  • Food allergies from the diet [3]
  • Infections (or lack of infections) during childhood [3-6][35-37]
  • Genetic susceptibility [7-10]
  • Exposure to various outdoor air pollutants
  • Exposure to various indoor air pollutants