You are here: » Signs and symptoms » Triggers 


In many cases, no “trigger” can be identified as responsible for an angioedema attack. Still, research has identified a number of factors that may be implicated in the development of swellings. These include:

  • Surgical procedures, for example tonsillectomy (especially in cases of laryngeal swelling)
  • Dental treatments, for example tooth extractions
  • In women, changes in the oestrogen level, menstruation and pregnancy


Other potential triggers include:

  • Physical exercise
  • Prolonged sitting or standing
  • Heat, cold
  • Contact with certain chemicals
  • Infectious disorders, including colds
  • Certain foods
  • Sudden changes in meteorological conditions
  • Medications that contain oestrogen (oral contraceptives, hormone replacement therapy)

In most cases, however, attacks begin without any identifiable trigger, thus impacting patients without prior warning.