Wednesday, August 10, 2011

Causes Of Hives And Angioedema

When you have an allergic reaction to a substance the body to release histamine and other chemicals in the blood. This causes itching, swelling and other symptoms. Nests are a common reaction, especially in people with other allergies such as hay fever.

When swelling or welts occur around the face, lips and eyes, is called angioedema. Swelling of angioedema can also occur around the hands, feet and throat.

Many substances can trigger hives, including:

Animal dander (especially cats)

Insect bites

Medicine

Pollen

Food Seafood, fish, nuts, eggs, milk and other

Hives may also develop due to:

Emotional stress

Extreme cold or sun exposure

Excessive sweating

Disease (including lupus, other autoimmune diseases, and leukemia

Infections like mononucleosis

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