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Sample Topic: Asthma

Asthma : Last revised in December 2013

What are the trigger factors?

  • Respiratory infections, most commonly viruses. Fungi, bacteria, or parasites may be responsible in some people.
  • Allergens, such as pollen, dust mites, and feathered or furry animals.
  • Airborne irritants, such as cigarette smoke, irritant dusts, cold air, vapours and fumes, atmospheric pollution.
  • Weather changes, such as cold air.
  • Exercise.
  • Emotional factors, such as stress or laughing.
  • Gastro-oesophageal reflux disease.
  • Allergic rhinitis and sinusitis.
  • Occupational sensitizers, such as isocyanates.
  • Drugs, such as nonsteroidal anti-inflammatory drugs and beta-blockers.
  • Foods containing sulphites, such as beer, wine, and shrimps.