Sunday, March 6, 2011

Trusted medical information to encourage healthy living. Enjoy free health tools and view detailed doctor-reviewed information about diseases, medical symptoms, treatments, drugs, and nutrition.Finding the right Urticaria,hives treatment means understanding the possible causes of Urticaria Hives Skin Rash.

<font color="#ffffff">hives,ringworm, urticaria,rash,heat rash,allergy symptoms,ringworm,dermatitis,allergic reactions,allergy,ringworm treatment,measles,impetigo,ringworms,dermatitis,allergic reactions,skin problems,hives,hives skin,allergy hives,allergy rash,rashes of the skin,symptoms of hiv,skin allergy,homeopathic remedies,shingles,psoriasis,skincare,allergy,food allergies,skincare,how long do hives last,causes for hives,urticaria,hives treatments,ringworm,</font> <p>&nbsp;<u><strong><font size="6"><font color="#ff0000" face="georgia,palatino"><em>Hives {</em></font><font face="Georgia"><font color="#ff0000">Urticaria} </font></font></font></strong></u></p><p align="right"><u><strong><font size="6"><font face="Georgia"><font color="#ff0000">{Skin Rash </font><font color="#ff0000">Hives} </font></font></font></strong></u></p><p><font size="4"><font face="georgia,palatino"><u><em><strong<BR>
> Hives {Urticaria}
{Skin Rash Hives}
Hives are raised, often itchy, red welts on the surface of the skin. They are usually an allergic reaction to food or medicine.

 Symptoms: Itching; Swelling of the surface of the skin into red- or skin-colored welts

Hives is frequently caused by allergy|allergic reactions; however, there are many non-allergic 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 patients with chronic hives have an unknown (idiopathic) cause.

 Perhaps as many as 30/40% of patients with chronic idiopathic urticaria will, in fact, have an autoimmune cause. 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.

 Whether the trigger is allergic or non-allergic, there is a complex release of inflammatory mediators, including histamine from cutaneous ,mast cells, resulting in fluid leakage from superficial blood vessels.

Wheals may be pinpoint in size, or several inches in diameter. Angioedema is a related condition (also from allergic and non-allergic causes), though fluid leakage is from much deeper blood vessels.

Individual hives that are painful, last more than 24 hours, or leave a bruise as they heal are more likely to be a more serious condition called urticarial vasculitis. Hives caused by stroking the skin (often linear in appearance) are due to a benign condition called Dermatographic urticaria|dermographism.
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 often fit in this category.
===Chronic===

[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.
Related conditions

Angioedema is similar to urticaria but in angioedema, the swelling occurs in a lower layer of the dermis than it does in urticaria,
 as well as in the subcutis.
This swelling can occur around the mouth, in the throat, in the abdomen, or in other locations.
Urticaria and angioedema sometimes occur together in response to an allergen and is a concern in severe cases as angioedema of the throat can be fatal.
CauseMany different substances in the environment can cause urticaria including: medications, food, and physical agents.
===Medications===

The anti-diabetic [[sulphonylurea]] [[glimepiride]] (trade name Amaryl), in particular, has been documented to induce allergic reactions manifesting as urticaria.

Other cases include dextroamphetamine ,aspirin, ibuprofen, penicillin, clotrimazole, sulfonamide (medicine)|sulfonamides and anticonvulsants.
===Diet===

The most common food allergies in adults are shell fish and Nut (fruit)|nuts.
The most common food allergies in children are shellfish, nuts, peanuts, egg (food)|eggs, wheat, and soy.
It is uncommon for patients to have more than 2 true food allergies.

   ===Physical agents===

A number of physical urticarias include
Reaction to water(exceedingly rare)
**Reaction to body heat, such as when Exercise urticaria,exercising or after a hot shower
**Cold ,Chronic cold urticaria,: Reaction to cold, such as ice, cold air or water - worse with sudden change in temperature
**Delayed Pressure: Reaction to standing for long periods, bra-straps, elastic bands on undergarments, belts

**Dermatographic urticaria|Dermatographic: Reaction when skin is scratched (very common)

**Heat: Reaction to hot food or objects (rare)

**Solar: Reaction to direct sunlight (rare, though more common in those with fair skin)

**Vibration: Reaction to vibration (rare)

**Adrenergic: Reaction to adrenaline / noradrenaline (extremely rare) 
Urticaria can be a complication and symptom of a parasitic infection ..The rash that develops from poison ivy, poison oak, and poison sumac contact is commonly mistaken for urticaria.
This rash is caused by contact with [urushiol] and results in a form of  contact dermatitis called Urushiol-induced contact dermatitis.

 Urushiol is spread by contact, but can be washed off with a strong grease/oil dissolving detergent and cool water and rubbing ointments.

 Infections : Hive-like rashes commonly accompany viral illnesses, such as the common cold. They usually appear 3–5 days after the cold has started, and may even appear a few days after the cold has resolved.


==Management==

Chronic urticaria can be difficult to treat. There are no guaranteed treatments or means of controlling attacks, and some sub-populations are treatment-resistant, with medications spontaneously losing their effectiveness and requiring new medications to control attacks.
It can be difficult to determine appropriate medications since some, such as loratadine, require a day or two to build up to effective levels and since the condition is intermittent and outbreaks typically clear up without any treatment.

Most treatment plans for urticaria involve being aware of one's triggers, but this can be difficult since there are several forms of urticaria and people often exhibit more than one type.

 == References ====External links==
*http://www.dermnet.com/moduleIndex.cfm?moduleID=19 Urticaria photo library at Dermnet

*http://en.wikipedia.org/wiki/Urticaria

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