What Are Hives? What Is Urticaria? What Causes Hives?

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what are hives


Urticaria - Wikipedia, the free encyclopedia

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** Urticaria **

From Wikipedia, the free encyclopedia
Jump to: navigation, search
"Hives" redirects here. For other uses, see Hive (disambiguation).


It has been suggested that /Exercise urticaria/ be merged into this
article. (Discuss) /Proposed since June 2013./

Urticaria
/Classification and external resources/

Urticaria on the arm
ICD-10 L50
ICD-9 708
DiseasesDB 13606
MedlinePlus 000845
eMedicine topic list
MeSH D014581

*Urticaria* (from the Latin /urtica/, nettle,^[1]) commonly referred to as
*hives*, is a kind of skin rash notable for pale red, raised, itchy bumps.
Hives might also cause a burning or stinging sensation.^[2] Hives are
frequently caused by allergic reactions; however, there are many
nonallergic causes. Most cases of hives lasting less than six weeks (acute
urticaria) are the result of an allergic trigger. Chronic urticaria (hives
lasting longer than six weeks) is rarely due to an allergy.

The majority of chronic hives cases have an unknown (idiopathic) cause. In
perhaps as many as 30–40% of patients with chronic idiopathic
urticaria, it is caused by an autoimmune reaction. Acute viral infection is
another common cause of acute urticaria (viral exanthem). Less common
causes of hives include friction, pressure, temperature extremes, exercise,
and sunlight.

*Contents*

· 1 Appearance
· 2 Classification

· 2.1 Acute versus chronic
· 2.2 By cause

· 2.2.1 Drug-induced
· 2.2.2 Infection or environmental agent
· 2.2.3 Dermatographic urticaria
· 2.2.4 Pressure or delayed pressure
· 2.2.5 Cholinergic or stress
· 2.2.6 Cold-induced
· 2.2.7 Heat-induced
· 2.2.8 Solar urticaria
· 2.2.9 Water-induced
· 2.2.10 Exercise
· 2.2.11 Food

· 2.3 Related conditions

· 2.3.1 Angioedema

· 2.3.1


Source: en.wikipedia.org/wiki/Urticaria

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