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Airway swelling (laryngeal attacks) can be life-threatening. Research indicates that in patients with undiagnosed HAE, mortality has been reported as high as 40% as a result of a laryngeal attack.
If you are having difficulty breathing due to swelling, seek immediate medical attention. Airway swelling requires close monitoring and, if necessary:
Make sure you always carry something with you, explaining that you have HAE, in case you are unable to communicate in an emergency.