The best way to prevent Angioedema in cases that do not involve a hereditary cause is to prevent all exposure to a trigger. For example, if a patient’s allergic Angioedema is caused by pet dander, ensuring that the patient is never exposed to pet dander is the best way to prevent an episode. Those with idiopathic Angioedema may wish to make lifestyle changes that limit exposure to environmental triggers and reduce stress in general.