Another name for the hives. Raised, itchy areas of skin that are usually a sign of an allergic reaction. Hives can be rounded or flat-topped but are always elevated above the surrounding skin. They reflect circumscribed dermal edema (local swelling of the skin). The hives are usually well circumscribed but may be coalescent and will blanch with pressure. The hives typically last less than 4 hours but they may stay for days or weeks. Approximately 20% of the population has experienced a bout of urticaria.
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An eruption of itching wheals, usually of systemic origin; it may be due to a state of hypersensitivity to foods or drugs, foci of infection, physical agents (heat, cold, light, friction), or psychic stimuli. SYN: hives (1), urtication (2). [L. urtica]
- acute u. SYN: febrile u..
- u. bullosa an eruption of wheals capped with subepidermal vesicles. SYN: u. vesiculosa.
- cholinergic u. a form of physical or nonallergic u. initiated by heat ( e.g., hot baths, physical exercise, pyrexia, exposure to sun or to a warm room) or by excitement; the rather distinctive lesions consist of pruritic areas 1–2 mm in diameter surrounded by bright red macules. SYN: heat u..
- chronic u. a form of u. in which the wheals recur frequently, or persist. SYN: u. chronica.
- u. chronica SYN: chronic u..
- cold u. wheal formation that develops after exposure to lowered temperatures, with or without demonstrable passive-transfer antibodies.
- u. endemica, u. epidemica u. caused by the nettling hairs of certain caterpillars.
- febrile u. u. accompanied by mild fever. SYN: acute u..
- giant u. SYN: angioedema.
- heat u. SYN: cholinergic u..
- u. hemorrhagica u. bullosa in which the serous exudate contains blood.
- u. maculosa a chronic form of u. with lesions of a red color and little edema.
- u. medicamentosa an urticarial form of drug eruption.
- papular u. a sensitivity reaction to insect bites, especially human and pet fleas, seen mostly in young children as wheals followed by papules on exposed areas.
- u. perstans a form of chronic u. in which the wheals persist unchanged for long periods; includes urticarial vasculitis.
- u. pigmentosa cutaneous mastocytosis resulting from an excess of mast cells in the superficial dermis, producing a chronic eruption characterized by flat or slightly elevated brownish papules which urticate when stroked. The disease in children frequently involutes spontaneously whereas resolution is rare with adult onset and there may be systemic lesions. SEE ALSO: diffuse cutaneous mastocytosis.
- pressure u. u. of unknown etiology occurring after local pressure on the skin.
- solar u. a form of u. resulting from exposure to sunlight; some patients have passive-transfer antibodies and others do not.
- u. subcutanea u. in which itching is present without the wheals.
- u. vesiculosa SYN: u. bullosa.
- vibratory u. a form of u. that occurs in response to vibratory stimuli.

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ur·ti·car·ia .ərt-ə-'kar-ē-ə, -'ker- n HIVES
ur·ti·car·i·al -ē-əl adj

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an itchy rash resulting from the release of histamine by mast cell. Individual swellings (weals) appear rapidly and resolve spontaneously within hours. Acute urticaria is common and represents an immediate response to such allergens as seafood or strawberries. Chronic urticaria is not an allergic condition and may persist for years. Angio-oedema occurs when the weals involve the lips, eyes, or tongue, which may swell alarmingly and constitute a medical emergency. Urticaria can be prevented by taking antihistamines regularly. Cholinergic urticaria is a condition in which very small weals are brought on by heat, exercise, or emotion; treatment may be with hydroxyzine or ketotifen.

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ur·ti·ca·ria (ur″tĭ-karґe-ə) [Urtica + -ia] a vascular reaction in the upper dermis, usually transient, consisting of localized edema caused by dilatation and increased capillary permeability with wheals. Most types are named for the causative stimulus or mechanism, such as physical urticaria and contact urticaria. Angioedema is the same physiological response in the deep dermis or subcutaneous or submucosal tissues. Called also hives. urticarial, urticarious adj


Medical dictionary. 2011.

Look at other dictionaries:

  • Urticaria — inducida por antibióticos. La urticaria es una enfermedad de la piel caracterizada por lesiones cutáneas edematosas, de contornos delimitados y con un halo eritematoso, generalmente evanescentes y cambiantes. La urticaria va acompañada,… …   Wikipedia Español

  • urticaria — f. dermat. Reacción vascular que afecta a la dermis superior y que se caracteriza por la aparición en cualquier parte del cuerpo de pápulas rojas de tamaño variable sobre zonas más o menos extensas, fugaces y muy pruriginosas. Las causas que… …   Diccionario médico

  • Urticaria — Ur ti*ca ri*a, n. [NL. See {Urtica}.] (Med.) The nettle rash, a disease characterized by a transient eruption of red pimples and of wheals, accompanied with a burning or stinging sensation and with itching; uredo. [1913 Webster] …   The Collaborative International Dictionary of English

  • Urticarĭa — (lat.), der Nesselausschlag, s.d …   Pierer's Universal-Lexikon

  • Urticarĭa — (lat.), s. Nesselsucht …   Meyers Großes Konversations-Lexikon

  • Urticaria — Urticarĭa (lat.), der Nesselausschlag (s.d.) …   Kleines Konversations-Lexikon

  • Urticaria — vgl. Urtikaria …   Das Wörterbuch medizinischer Fachausdrücke

  • urticaria — Mod.L., from L. urtica nettle, from urere to burn. The native name is nettle rash …   Etymology dictionary

  • urticária — s. f. Erupção cutânea semelhante no prurido ao que produz o contato da ortiga …   Dicionário da Língua Portuguesa

  • urticaria — (Del lat. urtīca, ortiga). f. Med. Enfermedad eruptiva de la piel, cuyo síntoma más notable es una comezón parecida a la que producen las picaduras de la ortiga …   Diccionario de la lengua española

  • urticaria — [ʉrt΄ə ker′ē ə] n. [ModL < L urtica, a nettle] HIVES urticarial adj …   English World dictionary

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