41. Hives (Urticaria) urticaria are raised, red, itchy areas of the skin which are calledhives, wheals or welts. Advertisement. Hives (urticaria). Raised http://allergies.about.com/library/weekly/aa060799.htm

zfp=-1 About Allergies Search in this topic on About on the Web in Products Web Hosting Allergies with Judy Tidwell Your Guide to one of hundreds of sites This page sponsored by Home Articles Forums Chat ... Help zmhp('style="color:#fff"') Subjects ESSENTIALS Allergy Symptoms Food Allergies/Intolerances Skin Conditions ... All articles on this topic Stay up-to-date! Subscribe to our newsletter. Advertising Free Credit Report Free Psychics Advertisement Hives (Urticaria) Raised, Red, Itchy Areas of the Skin Join This Discussion "I am a 58 year old man and have suffered what my dermatologist says could be hives. It first occurred about a year ago and I have no idea what causes its onset. Per reading various Internet sites, the medical field doesn't know either. The cause could be most anything." Related Resources Additives Drug Allergies Food Allergies Hayfever ... Surviving Winter's Itch From Other Guides Chronic Hives, Rashes Associated with Bacteria, Autoimmunity All About Hives Elsewhere on the Web Causes of Uticaria Chronic Hives Receive Site Updates Subscribe to Newsletter Your Email Address: Urticaria simply means itching with rash. Urticaria are raised, red, itchy areas of the skin which are commonly known as hives, wheals or welts. The quantity, color, and shapes of hives can vary. The color can vary from light pink to dark red, depending on the amount of fluid build up. The shape of the wheals are usually round, although bizarre patterns occasionally develop. They can last from a few hours to several weeks or months.

42. Urticaria Acute urticaria. Hives lasting less than six weeks are caused by acuteurticaria . Colds are a common cause in children. Chronic urticaria. http://www.nyallergy.com/Conditions/urticaria.htm

Offices Your Allergists Get Tested Get Treated ... NY Medical Doctor Urticaria - Hives Hives are pale red swellings of skin "wheals" that occur in groups on any part of the skin. Urticaria is the medical word for hives. Each hive lasts a few hours before fading without trace. New areas may develop as old areas fade. They can vary in size from as small as a pencil eraser to as large as a dinner plate and may join together to form larger swellings. Hives are usually are itchy, but may also burn or sting. Hives are formed by blood plasma leaking out of small blood vessels in the skin. This is caused by the release of a chemical called histamine. Histamine is released from cells called "mast cells" which lie along the blood vessels in the skin. Allergic reactions, chemicals in foods, or medications can cause histamine release. Sometimes it's impossible to find out why hives are forming. Hives are very common 10-20 percent of the population will have at least one episode in their lifetime. Hives usually go away within a few days to a few weeks. Occasionally, a person will continue to have hives for many years. When hives form around the eyes, lips or genitals, the tissue may swell excessively. Although frightening, the swelling usually goes away in less than 24 hours.

43. Urticaria CONTENTS. viii. Preface. 521. Executive Summary. Part I Acute urticaria/Angioedema c .525. Algorithm for Acute urticaria/Angioedema. 525. http://www.jcaai.org/Param/Urticaria.htm

CONTENTS viii Preface Executive Summary Part I: Acute Urticaria/Angioedema Algorithm for Acute Urticaria/Angioedema Annotations for the Algorithm of Acute Urticaria/Angioedema Commentary 1 Commentary 2 References Part II: Chronic Urticaria/Angioedema Algorithm for Chronic Urticaria/Angioedema Annotations for the Algorithm of Chronic Urticaria/Angioedema Commentary 1 Commentary 2 Commentary 3 References

44. Urticaria urticaria Hives. Hives are pale red swellings of skin wheals that occurin groups on any part of the skin. urticaria Acute urticaria. Hives http://www.allergytriggers.com/Conditions/urticaria.htm

Home Your Allergist Offices 1st Visit ... Search (866) MD-ALLERGY Urticaria - Hives Hives are pale red swellings of skin "wheals" that occur in groups on any part of the skin. Urticaria is the medical word for hives. Each hive lasts a few hours before fading without trace. New areas may develop as old areas fade. They can vary in size from as small as a pencil eraser to as large as a dinner plate and may join together to form larger swellings. Hives are usually are itchy, but may also burn or sting. Hives are formed by blood plasma leaking out of small blood vessels in the skin. This is caused by the release of a chemical called histamine. Histamine is released from cells called "mast cells" which lie along the blood vessels in the skin. Allergic reactions, chemicals in foods, or medications can cause histamine release. Sometimes it's impossible to find out why hives are forming. Hives are very common 10-20 percent of the population will have at least one episode in their lifetime. Hives usually go away within a few days to a few weeks. Occasionally, a person will continue to have hives for many years. When hives form around the eyes, lips or genitals, the tissue may swell excessively. Although frightening, the swelling usually goes away in less than 24 hours.

45. URTICARIA HELLENIC ASSOCIATION DERMATOLOGY VENEREOLOGY urticaria - ANAPHYLAXIS. 1 - urticariaGreaves, Malcolm W. Sabroe, Ruth A. British Medical Journal. May 11, 1998. http://www.edae.gr/urticaria.html

HELLENIC ASSOCIATION DERMATOLOGY - VENEREOLOGY URTICARIA - ANAPHYLAXIS A Letter to a Patient With Unrelenting Hives . By Neil Gershman, MD ABC of allergies: Allergy and the skin. IUrticaria Malcolm W Greaves and Ruth A Sabroe BMJ 1998; 316: 1147. Allergy and the skin. 1 - urticaria Greaves, Malcolm W. Sabroe, Ruth A. British Medical Journal. May 11, 1998. Blue Shield of California, I nc Allergy Glossary Health on the net foundation. Allergy Supply Company Home Page Allergy Testing - National Jewish Medical and Research Center, Allergy tests AllergyWeb ~ Chronic Urticaria ... Anaphylaxis - Managing Allergies and Asthma at School -National Institute of Allergy and Infectious Diseases Peer Review Status: Externally Peer Reviewed by the National Institute of Allergy and Infectious Diseases Anaphylaxis - Managing Allergies and Asthma at School National Institute of Allergy and Infectious Diseases Anaphylaxis [NJC] - National Jewish Medical and Research Center. Anaphylaxis Medscape Anaphylaxis Authored by Richard Krause, M.D., Residency Director, Clinical Assistant Professor of Emergency Medicine, Department of Emergency Medicine, State University of New York at Buffalo School of Medicine Anaphylaxis Columbia-Presbyterian Medical Center.William J. Davis, M.D.

46. Hives Hives urticaria. Book, Home mast cells. Causes Allergic urticariaType I Hypersensitivity (IgE mediated immediate) Medication reaction; http://www.fpnotebook.com/DER16.htm

Home About Links Index ... Editor's Choice Paid Advertisement (click above). Please see the privacy statement Dermatology Allergy Dermatitis ... Rhus Dermatitis Assorted Pages Erythema Annulare Centrifugum Erythema Multiforme Erythema Multiforme Major Erythema Multiforme Minor ... Dermatographism Hives Urticaria Book Home Page Cardiovascular Medicine Dental Dermatology Emergency Medicine Endocrinology Gastroenterology General Medicine Geriatric Medicine Gynecology Hematology and Oncology HIV Infectious Disease Jokes Laboratory Neonatology Nephrology Neurology Obstetrics Ophthalmology Orthopedics Otolaryngology Pediatrics Pharmacology Prevention Psychiatry Pulmonology Radiology Rheumatology Sports Medicine Surgery Urology Chapter Dermatology Index Acne Allergy Bacteria Blister Cardiovascular Medicine Dermatitis Dry Endocrinology Environmental Injury Examination Ophthalmology Fungus Hair Hematology and Oncology Hyperplasia Infectious Disease Laboratory General Nails Parasite Pediatrics Pharmacology Pigment Prevention Procedure Psychiatry Rheumatology Sebaceous Sports Medicine Sweat Symptom Evaluation Wart Page Allergy Index Dermatitis Contact Dermatitis Contact Latex Dermatitis Contact Rhus Erythema Annulare Centrifugum Erythema Multiforme Background Erythema Multiforme Major Erythema Multiforme Minor Erythema Nodosum Urticaria Urticaria Papular Epidemiology Common (occurs in up to 20% of individuals) Pathophysiology Response to histamine release from cutaneous mast cells Causes Allergic Urticaria Type I Hypersensitivity (IgE mediated immediate) Medication reaction

47. HON Allergy Glossary Urticaria HON Allergy Glossary, urticaria urticaria is a skin condition, characterized bythe development of itchy, raised white lumps surrounded by an area of red http://www.hon.ch/Library/Theme/Allergy/Glossary/urticaria.html

Allergy : A B C ... W X Y Z Pollen Calendar More on this topic Relevant sites from HON's MedHunt: Urticaria Hives Atopic dermatitis Dermographism Multimedia from HONselect: Urticaria image (www.dermnet.org.nz) External survey "Questionnaire on mood" conducted by the "IMSP- Faculty of Medicine - University of Geneva" Urticaria Hives Urticaria is a skin symptom that accompanies many allergic disorders . It is a relatively common disorder caused by localized mast-cell degranulation, with resultant dermal venular hyperpermeability culminating in pruritic wheals. Mostly results from an antigen-induced ( pollens foods drugs insect venom ) release of histamine and other vasoactive amines via sensitization with specific IgE antibodies. Most individual lesions develop and fade within 24 hours. Allergic skin diseases such as urticaria and angioedema as well as atopic dermatitis are not clearly defined as true allergic diseases. Urticaria and angioedema are both due to excessive mast cell activity in the skin. Chronic urticaria and angioedema are seldom due to a definable IgE mechanism (as is the case with all allergies) but, when determined, is generally due to a

48. Ask Dr.Shah: Urticaria Information And Treatment What is urticaria? urticaria also called nettlerash or hives or wealsin a common language, simply means itching with rash. Medically http://www.askdrshah.com/urti.htm

HOME INTRO. ASK WHAT? ABOUT DR.SHAH ... BOOKS What is Urticaria? Urticaria also called nettle-rash or hives or weals in a common language, simply means itching with rash. Medically, urticaria may be defined as skin eruption which is allergic in origin and is characterized by profound itching, red circular or irregularly shaped eruption on any part of the body which has a tendency to remain for a variable period, having a tendency to disappear and reappear. It tends to disappear without leaving behind any trace. Urticaria is an allergic skin disorder. Characteristically the skin eruptions are erythematous, raised above the skin level, with intense itching and usually worse by itching, with slight local warmth. Location and duration: Well, urticaria may appear on any part of the skin. Angio-oedema is a condition when deep tissues are affected. The typical lesions may last for one minute to half an hour. Some may last longer. Some patients may get the eruptions once in a while, some may have them many times during the day. It may be restricted to a couple of spots in some patients while some may have them real wide spread rashes appearing for days or even months together. There are acute, subacute, chronic and recurring variants as far as the frequency and duration are concerned.

49. Urticaria urticaria. Chronic urticaria is common and extremely difficult condition. In UKabout 1% of the population will suffer from urticaria during their lifetime. http://www.manbir-online.com/diseases/urticaria-1.htm

Sorry, your browser doesn't suppor Java. Urticaria Chronic Urticaria is common and extremely difficult condition. Epidemiological data available is scare. In UK about 1% of the population will suffer from urticaria during their lifetime. Out of this appox. 25 % of the patients would be of chronic urticaria. Chronic urticaria presents in a variety of presentation. About 5 % are shown to be Reactive to the food allergens . 5% may have urticarial vasculitis Physical urticaria is seen in about 35%-40 %, while aprox. 50 % have so called Idiopathic Urticaria Physical Urticaria - in this most striking is dermographism. A useful procedure in confirming the diagnosis of dermographism is challenge test with a caliberated dermographometer, which measures the pressure being applied to the skin. Other common physical urticarias are cold urticaria, cholinergic urticaria and solar urticaria. Cold urticaria can be tested by appliing ice to the skin., cholinergic urticaria can be seen by exercising the patient or bathing in warm water and solar urticaria can be tested by solar simulator lamp. Patients with physical urticaria need no firther investigations. The patients shold be informed of the condition for which the average time cource os 2-3 years. and during this time the main therapeutic approach is to cover the patient with H1 antihistamine. Very little is known about the pathogenesis of the physical urticaria.

50. Urticaria - Schering-Plough/Hud/Dermatologens Patientinformation Nr 8 Patientinformation nummer 8; urticaria. urticaria (nässelutslag) är ett vanligtsjukdomstillstånd som cirka 20% av alla vuxna har haft någon gång. http://www.huden.nu/dermatologen/patinfo/1-10/8.shtml

Urticaria Patientinformation 8 < Föregående Startsidan Nästa >> Urticaria (nässelutslag) är ett vanligt sjukdomstillstånd som cirka 20% av alla vuxna har haft någon gång. Urticaria är ibland, men långt ifrån alltid, allergiskt utlöst. Det finns många andra uppkomstmekanismer, och också olika former av urticaria. Akut urticaria Detta är den vanligaste formen. Klåda och rodnade eller ljusa upphöjda kvaddlar i huden, kommer då på några minuter eller timmar, efter det att något utlösande ämne har tillförts kroppen. Ibland kan även lätt feber, svullnadskänsla i handflator och fotsulor, ledvärk eller magbesvär förekomma. I svårare fall kan svullnader i ansiktet uppkomma. Exempel på orsaker till akut urticaria är födoämnen (skaldjur, musslor, nötter, jordgubbar, kiwi, mögelost m m), färgämnestillsatser i sprit och godsaker, konserveringsmedel i läsk, dressing och såser, läkemedel (antibiotika, värktabletter med acetylsalicylsyra eller kodein, B-vitaminer, röntgenkontrastmedel m m), eller insektsstick (bi, geting). Akut urticaria visar ofta kraftiga symptom med klåda och utslag, men klingar sedan vanligen av efter någon eller några veckor. Kronisk urticaria Urticaria som varar mer än 6 veckor kallas ”kronisk” och kan pågå i flera månader, eller i sällsynta fall ett eller flera år. Den kan starta akut på grund av någon ovan nämnd orsak, och sedan fortsätta trots att den utlösande faktorn undvikes.

51. Hives Or Urticaria Are Skin Disorders Related  To Food Allergy  That Can Be So Skin Center. Hives or urticaria. Acute urticaria is Immediate Hypersensitivity.The type I version of urticaria tends to occur in acute http://www.nutramed.com/skin/skinhives.htm

Home Products and Services Medical Information Orders ... Skin Center Hives or Urticaria Skin Nutritional Rescue Skin Rescue Starter Pack Order Skin Rescue Starter Pack Hives - Advanced Topics ... Skin Center Alpha Nutrition Hives or urticaria are common allergic reactions. They are itchy, elevated, red blotches of varying size that appear suddenly and disappear mysteriously after hours to days. Hives may be associated with dramatic swelling reactions; swelling of the lips, eyes, and ears can suddenly and grotesquely alter the appearance of an allergy victim. Marked swelling especially of facial tissues is referred to as angioedema and is often associated with urticaria. Swelling of the lips and tongue may occur immediately after eating a food and may be life-threatening because of airway obstruction. Stephen Gislason MD Foods and drugs are the common causes of hives. Some patients get hives occasionally only when they ingest a specific food or food additives. Other get hives as a chronic problem which can go-on for years. Most studies of chronic hives suggest a low % of food allergy causes usually because diet revision attempts were inadequate to reveal the hidden food causes. Acute Urticaria is Immediate Hypersensitivity The type I version of urticaria tends to occur in acute discrete attacks and may follow the ingestion of specific foods, over-the counter medications, or prescription drugs. Atopic children with eczema and rhinitis are prone to urticaria from food. Hives are associated with high IgE and occur usually as acute food reactions. Hives also occur as a feature of anaphylactic reactions. The itchy, erythematous welts, typical of acute urticaria can occur in any distribution in the body. Infants may develop facial wheals on contact with food. Adults often have a single bout of hives when they encounter an unusual or seasonal food or take a drug. Hives following a strawberry feed in the summer or after a eating prawns at a sea-food restaurant are typical examples.

52. MEDLINEplus Enciclopedia Médica: Urticaria Translate this page urticaria. La urticaria es muy común especialmente en las personas que han experimentadootras reacciones alérgicas, como la fiebre de heno y angioedema. http://www.nlm.nih.gov/medlineplus/spanish/ency/article/000845.htm

Omita y vaya al Contenido Otros enciclopedia temas: A-Ag Ah-Ap Aq-Az B-Bk ... Z Urticaria Contenido: Nombres alternativos Definición Causas, incidencia y factores de riesgo Síntomas ... Urticaria en el tórax Nombres alternativos Volver al comienzo Ronchas Definición Volver al comienzo Son verdugones o ronchas de diversos tamaños, enrojecidos y elevados que aparecen y desaparecen en la superficie de la piel, y que por lo general causan prurito Causas, incidencia y factores de riesgo Volver al comienzo La urticaria es muy común especialmente en las personas que han experimentado otras reacciones alérgicas , como la fiebre de heno y angioedema . Los verdugones aparecen en la superficie de la piel en forma de parches. La liberación de histamina y de otras sustancias químicas en el torrente sanguíneo, asociada con la respuesta alérgica , causa prurito , inflamación localizada y otros síntomas. Muchas sustancias, llamadas alergenos, pueden provocar una respuesta alérgica que causa urticaria y entre los más comunes se pueden mencionar: Medicamentos Alimentos (como bayas

53. MEDLINEplus: Hives urticaria (American Academy of Allergy, Asthma, and Immunology); urticaria Hives (American Academy of Dermatology). Clinical Trials http://www.nlm.nih.gov/medlineplus/hives.html

Skip navigation Other health topics: A B C D ... List of All Topics Hives Contents of this page: General/Overviews Diagnosis/Symptoms Treatment Directories ... Children Search MEDLINE for recent research articles on Hives You may also be interested in these MEDLINEplus related pages: Allergy Immune System/AIDS Skin, Hair and Nails Symptoms and Manifestations General/Overviews Allergic Skin Conditions (American Academy of Allergy, Asthma, and Immunology) Also available in: Spanish Urticaria (American Academy of Allergy, Asthma, and Immunology) Urticaria - Hives (American Academy of Dermatology) Clinical Trials ClinicalTrials.gov: Urticaria (National Institutes of Health) Diagnosis/Symptoms Facial Swelling: Self-Care Flowcharts (American Academy of Family Physicians) Skin Rashes and Other Changes: Self-Care Flowcharts (American Academy of Family Physicians) Specific Conditions/Aspects Dermatographia (Skin Writing) (Mayo Foundation for Medical Education and Research) Exercise-induced Urticaria (Hives) (American Academy of Family Physicians) Hives and Iodine (Mayo Foundation for Medical Education and Research) Treatment Antihistamines (American Academy of Family Physicians) Directories Find a Dermatologist (American Academy of Dermatology) Organizations National Institute of Allergy and Infectious Diseases Children Help With Hives (Nemours Foundation) Information from the Medical Encyclopedia: Hives Health services in North Carolina Other states coming - learn more The primary NIH organization for research on Hives is the

54. Urticaria urticaria. Back to previous level Angioneurotic Edema Search PUBMEDfor Angioneurotic Edema All Review Therapy Diagnosis; Angioedema http://medir.ohsu.edu/cliniweb/C17/C17.800.862.945.html

Urticaria Back to previous level Angioneurotic Edema Search PUBMED for Angioneurotic Edema: All Review Therapy Diagnosis ... The Virtual Navy Hospital: General Medical Officer Manual: Urticaria and Angioedema

55. Urticaria (elveblest) urticaria (elveblest), Årsaken til elveblest er mange. Årsaken kanf.eks. være ben. Penicillin kan utløse urticaria (elveblest). http://www.hudlegekontoret.no/pasinstr/urticaria.htm

Urticaria (elveblest) Allergi mot matvarer som skalldyr fisk I blant vil prikktestning kunne bekrefte en allergi som man har mistanke om, f.eks. allergi mot pelsdyr eller mot matvarer. I enkelte tilfeller kan allergi mot gummi , metaller, parfymer osv. som ellers normalt gir eksemreaksjoner i stedet gi elveblestreaksjoner (i lettere tilfeller). UV-behandling (lysbehandling) Les mer om urticaria Norsk Doktoronline Helsenett Helsenytt Hudpedagogisk senter ... Lommelegen Dansk NetDoktor.dk Sundhed.dk Svensk NetDoktor.se huden.nu Engelsk American Academy of Dermatology Dermnet Emedicine (for legen) Emedicine (for pasienten) Se fler bilder av urticaria DOIA - Dermatology Online Atlas (Urticaria) (Urticaria) Oppdatert januar 2003 Velg et fylke... Akershus Aust-Agder Buskerud Finnmark Hedmark Hordaland Nordland Oppland Oslo Rogaland Sogn og Fjordane Telemark Troms Vest-Agder Vestfold Østfold Tilbake

56. Allergy And Asthma - Urticaria/Hives - Methodist Health Care System, Houston, Te urticaria / Hives What is urticaria? urticaria exercise. chronic urticaria recurrent hives with no known cause. What is angioedema? Angioedema http://www.methodisthealth.com/health/allergy/uticaria.htm

Home Page Las Alergias y el Asma (en español) Clinical Services The Methodist Hospital Methodist Diagnostic Hospital Methodist Sugar Land Hospital Methodist Willowbrook Hospital ... Allergy and the Immune System Allergens: Animals Chemical Sensitivity Dust and Dust Mites Food ... Appointment Urticaria / Hives What is urticaria? Urticaria, or hives, is a condition in which red, itchy, and swollen areas appear on the skin usually as an allergic reaction from eating certain foods or taking certain medicines. What foods commonly cause hives? nuts tomatoes shellfish berries What medicines commonly cause hives? penicillin sulfa anticonvulsant drugs phenobarbital aspirin Other causes of hives: dermatographism - hives caused by scratching the skin, continual stroking of the skin, or wearing tight-fitting clothes that rub the skin. cold-induced - hives caused by exposure to cold air or water. solar hives - hives caused by exposure to sunlight or light-bulb light. exercise chronic urticaria - recurrent hives with no known cause.

57. Allergy And Asthma - Uticaria/Hives - Spanish Content - Methodist Health Care Sy Translate this page La urticaria / Las Ronchas. ¿Qué es la urticaria? Ejercicio. urticaria crónica- ronchas recurrentes sin ninguna causa conocida. ¿Qué es el angioedema? http://www.methodisthealth.com/spanish/allergy/uticaria.htm

Página Principal de Las Alergias y el Asma Servicios Clínicos Methodist Diagnostic Hospital Methodist Sugar Land Hospital Methodist Willowbrook Hospital San Jacinto Methodist ... Las Alergias y el Sistema Inmunológico Los Alergenos:Los Desencadenantes de los Ataques de Alergia Los Animales La Sensibilidad Química El Polvo y los Ácaros del Polvo Los Alimentos ... La Hiedra Venenosa / El Zumaque Venenoso Las Condiciones Sintom áticas de las Alergias El Asma La Dermatitis Atópica La Dermatitis por Contacto La Rinitis ... Plan Para Hacer una Cita Médica Póngase en Contacto con Nosostros: Referencia Médica Plan Para Hacer una Cita Médica Preguntas Generales Planes de Salud ... Directorio de Médicos La Urticaria / Las Ronchas ¿Qué es la urticaria? La urticaria, o ronchas, es una condición en la que aparecen en la piel áreas rojas, hinchadas y que pican - normalmente como consecuencia de una reacción alérgica producida al comer determinados alimentos o tomar ciertos medicamentos. ¿Qué alimentos causan ronchas comúnmente?

58. Urticaria urticaria urticaria, Hyperthyroidism, Physical urticarias eg, Cold, heat,vibration, Psychological stress, Mastocytosis (urticaria pigmentosa), http://www.rcpa.edu.au/pathman/urticari.htm

Urticaria Urticaria Acute Skin prick allergen testing or allergen specific immunoglobulin E to relevant antigen(s). Immunoglobulin E is not of clinical value. Anaphylaxis Angioedema Foods, ingested chemicals Drugs esp Amoxycillin Aspirin Stings and bites Contactants eg Latex Cosmetics Blood components See Blood transfusion - complications. Infections esp Viral, in children Chronic FBC CRP or ESR Skin biopsy , if indicated. Food intolerance/allergy Idiopathic Drug reactions esp Aspirin Penicillin Sulphonamides Underlying conditions Connective tissue diseases Vasculitis Malignancy Hepatitis B prodrome See Hepatitis B virus infection Lymphoma (non-Hodgkins) Hyperthyroidism Physical urticarias eg Cold, heat, vibration Psychological stress Mastocytosis (urticaria pigmentosa)

59. HAPS - Education Information - Urticaria And Angioedema Information Sheets. urticaria and Angioedema. Introduction. urticaria Acareful clinical history is therefore paramount. Acute urticaria. Acute http://www.haps.nsw.gov.au/edrsrch/edinfo/urtang.html

Home Information Sheets Information Sheets Urticaria and Angioedema Introduction Urticaria, often called "hives", refers to a skin eruption consisting of raised demarcated intensely itchy papules or weals. While urticaria involves dermal swelling, angioedema is due to oedema in the deeper subcutaneous and submucosal tissues, especially involving the palms of the hands, soles of the feet, head, and neck. Angioedema of the throat may cause respiratory obstruction in severe cases. Urticaria/angioedema has been arbitrarily defined as ‘Acute’ if it lasts less than 6 weeks, with more prolonged cases of relapsing skin swellings being labelled as ‘Chronic’. Up to 50% of cases of urticaria are associated with angioedema, and up to 25% of the population will develop one of these problems during their lifetime. Pathophysiology Tissues involved in urticaria/angioedema reveal dermal or subcutaneous oedema in association with a perivascular infiltrate of T-lymphocytes, macrophages, eosinophils and mast cells which may be sparse and fleeting in acute cases or more extensive in chronic urticaria. The swelling and itch seen in urticaria/angioedema is due to mast cell degranulation. The triggers include a variety of factors (Table 1). However, in up to 50% of cases of acute and chronic urticaria/angioedema, no cause is identified. Some physical urticarias involve structural modification of the IgE molecule by various physical factors, and are IgE-mediated.

60. Urticaria (hives) American Osteopathic College of Dermatology skin disease database urticaria is themedical name for hives.These are welts; pink swellings that come up on any http://www.aocd.org/skin/dermatologic_diseases/urticaria.html

Urticaria (Hives) Urticaria is the medical name for hives. These are welts; pink swellings that come up on any part of the skin. They itch and each individual hive lasts a few hours before fading away, leaving no trace. New hives appear as old areas fade. They can be pea sized or join to cover broad areas of the body. While the itch can be intense, the skin is usually not scabbed or broken. In some people the hives burn or sting. Hives are very common with 10-20 percent of the population having at least one episode in their lifetime. Hives can sometimes occur in deeper tissues of the eyes, mouth, hands or genitals. These areas mat develop a swelling that is frightening in appearance, but usually goes away in less than 24 hours. This swelling is called angioedema. In many cases, a single attack of hives is due to an infection or virus and these go away within a few days to a few weeks. Some people get repeated attacks that occur as an allergic reaction to a variety of things (foods, most commonly nuts, chocolate, fish, tomatoes, eggs, fresh berries and milk, insect stings, and medications). In this case, they usually break out within a few hours of the exposure. Usually, the patients figure out the cause by themselves, and they never bother coming to a doctor. Certain people can develop recurrent hives from sunlight, cold, pressure, vibration or exercise. These are called the physical urticarias. If hives develop from scratching or firmly rubbing the skin it is called dermatographism. It is the most common of the physical urticarias and it affects about 5 percent of the population. It doesn't always itch. This condition sometimes also occurs along with other forms of hives.

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