Angioedema is swelling underneath the skin. It's usually a reaction to a trigger, such as a medication or something you're allergic to.
It isn't normally serious, but it can be a recurring problem for some people and can very occasionally be life-threatening if it affects breathing.
There are several different types of angioedema, each of which has a different cause.
It can be caused by:
But in many cases, it's not clear what causes angioedema. This is known as "idiopathic angioedema".
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