Urticaria

Description

Introduction

Urticaria is an allergic disorder marked by raised oedematous patches of skin or mucous membrane and usually intense itching and caused by contact with a specific precipitating factor (such as a food, drug, or inhalant) either externally or internally.

Hives, also known as Urticaria, affects about 20 percent of people at some time during their lives. It can be triggered by many substances or situations and usually starts as an itchy patch of skin that turns into swollen red welts. The itching may be mild to severe. Scratching, alcoholic beverages, exercise and emotional stress may worsen the itching.

Causes

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Some food (especially peanuts, eggs, nuts and shellfish).

Medications, such as antibiotics (especially penicillin and sulpha), aspirin and ibuprofen.

Insect stings or bites.

Physical stimuli, such as pressure, cold, heat, exercise or sun exposure.

Latex.

Blood transfusions.

Bacterial infections, including urinary tract infections and strep throat.

Viral infections, including the common cold, infectious mononucleosis and hepatitis.

Pet dander.

Pollen.

Some plants, such as poison oak and poison ivy.

Symptoms:

Batches of red or skin-colour welts (wheals), which can appear anywhere on the body.

Welts that vary in size, change shape, and appear and fade repeatedly as the reaction runs its course.

Itching, which may be severe.

Painful swelling (angioedema) of the lips, eyelids and inside the throat.

A tendency for signs and symptoms to flare with triggers such as heat, exercise and stress.

A tendency for signs and symptoms to persist for more than six weeks and to recur frequently and unpredictably, sometimes for months or years.