Angioedema is similar to urticaria in that it is prone to occur in people with allergies, and specific medications, foods, dust mites, pollen, infections, and physical and chemical stimuli such as excessive cold and heat can cause the onset.
If there is an obvious trigger for a previous attack, care should be taken to avoid it, and if no trigger is clear, the first thing to do is to be alert to the factors mentioned above. Secondly, it is important to actively recall possible triggers for future episodes and to avoid them in the future.