Urticaria history and symptoms
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]
History and Symptoms
- Acute urticaria usually show up a few minutes after contact with the allergen and can last a few hours to several weeks. Food allergic reactions typically fit in this category. Common causes of reaction include consumption of shellfish, nuts, eggs, fish, acid derivatives, dye, or a combination of these.
- Chronic urticaria refers to hives that persists for 6 weeks or more. There are no visual differences between acute and chronic urticaria. Some of the more severe chronic cases have lasted more than 20 years. A survey indicated that chronic urticaria lasted a year or more in more than 50% of sufferers and 20 years or more in 20% of them. Of course this does mean that in almost half the people it clears up within a year and in 80% it clears up within 20 years or less.[1]
- Drug-induced urticaria has been known to result in severe cardiorespiratory failure. The anti-diabetic sulphonylurea glimepiride (trade name Amaryl®), in particular, has been documented to induce allergic reactions manifesting as urticaria. Other cases include dextroamphetamine[2], aspirin, penicillin, clotrimazole, sulfonamides and anticonvulsants.
- Physical urticariaThe symptoms develop after exposure to the physical agent.
References
- ↑ Champion RH, Roberts SO, Carpenter RG, Roger JH (1969). "Urticaria and angio-oedema. A review of 554 patients". Br. J. Dermatol. 81 (8): 588–97. PMID 5801331.
- ↑ "Prescribing Information Dexedrine". GlaxoSmithKline. June 2006.