Is hereditary angioedema different from regular angioedema?

Inherited v acquired: Angioedema, a condition involving rapid swelling & accumulation of fluid in the skin & deeper tissues, is usually classified as hereditary (similar episodes run in the family) or acquired (due to medications or other allergic reaction). A third category sometimes used is idiopathic, meaning no obvious pathology or cause can be determined. Angioedema can involve the airways & cut off breathing.

Allergy or not: Angioedema such as swelling of the tongue or lips can occur as the result of an allergy to food or medication. It is usually associated with hives (urticaria). The presence of hives essentially rules out the allergic cause making hereditary or acquired c-1 inhibitor deficiency likely. However, the lack of hives does not rule out allergy. See an allergist for further evaluation either way!