The first time you are exposed to
an allergen in the air, your body's immune system may recognize the allergen as
a foreign substance. Your body reacts by making
antibodies against the allergen.
The next time you are
exposed to the allergen, the antibodies react to it. This releases histamine and
other chemicals that cause the symptoms of your allergy. This is called
sensitization. Sensitization may occur early in life.
It is possible that the main title of the report Angioedema, Hereditary is not the name you expected. Please check the synonyms listing to find the alternate name(s) and disorder subdivision(s) covered by this report.
can also affect your quality of life. You may avoid seeing people, have
problems sleeping, and feel tired or grumpy. You may have trouble with
school or work.
In this article
This information is produced and provided by the National
Institute (NCI). The information in this topic may have changed since it was written. For the most current information, contact the National
Institute via the Internet web site at http://
.gov or call 1-800-4-CANCER.
WebMD Medical Reference from Healthwise
March 12, 2014
This information is not intended to replace the advice of a doctor.
Healthwise disclaims any liability for the decisions you make based on this