Hives, known in the medical literature as urticaria, are a localized itchy outbreak of the skin. In this essentially allergic reaction, the skin breaks out in bumps surrounded by elongated flares. These "hives" are referred to as wheals or welts. The welts tend to be pink except that they turn white when touched. Welts may coalesce into plaques covering substantial areas of skin.

Hives are intensely itchy. They may involve any area of the body from the scalp to the soles of the feet, and appear in crops of 24- to 72-hour duration. The most common sites for outbreaks are the hands, feet, and face. Angioedema, a swelling below the skin caused by the same allergic mechanism, usually occurs around the eyes and in the lips. While the itchy bumps usually go away without treatment, angioedema in the upper respiratory tract may be life threatening and requires immediate medical attention.

A survey of college students indicates about one in five people has hives at some point in life. They may occur at any age, but young adults in their twenties are the most frequently affected. The precise causes of the condition vary person to person.

Aspirin sensitivity is observed in up to 67 percent of persons who have recurrent outbreaks of hives. Aspirin alters the metabolism of free fatty acids so that it favors the production of leukotrienes. These are hormonal messengers that make the walls of blood vessels more permeable to histamine. Aspirin also makes the lining of the intestines more permeable to allergens, increasing the risk of reaction to common food allergens such as cheese, chocolate, eggs, milk, pineapple, shellfish, and strawberries. At least one study found taking a single adult aspirin daily for three weeks desensitizes the immune system to aspirin and also to foods, but the benefits vanish if aspirin is discontinued.

Two factors increase the risk of outbreaks of hives after eating allergenic foods. One is incomplete digestion. A study published in the 1940’s reported that of 77 patients diagnosed with chronic hives, 65 had failures to produce enough stomach acid to break down the proteins that cause allergies. Treatment with hydrochloric acid and a vitamin B complex relieved symptoms in most of the patients in the study. Failure to secrete sufficient gastric acid is especially common in persons over the age of 60. It may be a major contributing factor in repeated outbreaks of hives after consuming allergenic foods in older persons.

Another contributing factor to recurrent food allergies is the permeability of the intestinal wall. This is the reason reactions to food are more severe when they are consumed after taking aspirin. Aspirin irritates the lining, increasing its permeability and easing transport of allergens into the bloodstream. Alcohol, NSAIDs, and many food additives have a similar effect. Consuming any substance that irritates the lining of the digestive tract increases the severity of the food allergy that causes hives.

Food colorings, especially yellow dye #5 (tartrazine), can provoke hives in about 0.1 percent of the population. Tartrazine is added to almost every food and even antihistamines, antibiotics, sedatives, and steroids. This yellow dye modifies fatty acid metabolism in the same manner as aspirin and increases the susceptibility of the skin to allergic inflammation.

Food flavorings are a major factor in many cases of hives in children. A wide range of salicyclic acid esters flavors cake mixes, chewing gum, puddings, and soft drinks. These chemical relatives of aspirin also occur naturally in curry powder, dill, licorice, oregano, paprika, peppermint, prunes, raisins, and turmeric. The average child consumes as much 200 mg of salicylate per day. This dosage approaches the amount of salicylate in children’s aspirin. Other flavorings, including aspartame, cinnamon, menthol, and vanilla may produce urticaria in some individuals.

The food preservatives BHA (butylated hydroxyanisol) and BHT (butylated hydroxytoluene) provoke reactions in about 15 percent of individuals who have chronic hives. As many as 44 percent of persons with chronic urticaria are allergic to benzoates, which occur in relatively high concentrations in fish and shrimp. Sulfites, which are sprayed on fruits, vegetables, and shrimp to keep them fresh in countries outside the United States, aggravate a wide range of allergic conditions, including asthma as well as hives. Sulfites occur naturally in beer and wine.

About 1 in 10 people is allergic to penicillin, and about 1 in 4 of those allergic to penicillin will develop urticaria, angioedema, or anaphylaxis after taking it. Penicillin is a common additive to livestock feeds. Both skin outbreaks and anaphylactic reactions have been traced to penicillin in frozen dinners, milk, and soft drinks. Among patients with chronic hives and an allergy to penicillin, about half will improve on a dairy-free diet.

Read an Apple a Day Make Keep Allergies, Asthma, & Eczema Away. Robert Rister is the author or co-author of nine books on natural health including Healing without Medication.

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Get Detailed Information On Urticaria

Urticaria (Hives) is a condition in which there are raised red spots or eruptions of various size on the surface of the skin, often itchy, which come and go. It is usually an allergy to a drug or some food item. Urticaria may vary in size and may join together to form larger swellings.

Urticaria is a common disorder, characterised by formation of weals on the skin. The disease is also known as nettle-rash as the rash of urticaria resembles the sting of a nettle. The disease may be acute, Chronic, or recurrent.

Urticaria is an allergic skin rash also known as ‘nettle rash’ or hives. There are two distinct types: acute urticaria is often caused by an allergy and can last between several hours and six weeks; chronic urticaria persists beyond six weeks. Most hives go away within days to a few weeks. Occasional unlucky individuals will have itches and swellings that come and go over many years. Urticaria is classified as either acute or chronic. Acute urticaria is defined as urticaria that has been present for less than 6 weeks.

The physical urticarias form a heterogeneous group of diseases due to the wide range of eliciting stimuli or clinical pictures as well as their association with other types of urticaria. Dermographic, cold, and pressure urticaria often occur together with chronic idiopathic, cholinergic, or other physical urticarias. In contrast, solar or heat urticaria mostly appear either as isolated diseases or are associated only with other types of physical urticaria.

Angioedema, on the other hand, is usually not red or itchy, but tends to sting and burn, and can be described as ‘numbness.’ This swelling can be severe, and if it affects a person’s ability to breathe, can be life-threatening.

Urticaria also called nettle-rash or hives or wheals in a common language, simply means itching with rash and mainly effects the neck, arms, legs and trunk of the children. Urticaria is an allergic reaction pattern of the skin, characterized by eruption of wheals or hives, which are itchy, transient, reddish and edematous swelling of the skin and mucosal surfaces that spread by peripheral extension and assume bizzare patterns on the skin. Wheals are caused by release of histamine and other chemical mediators which are released by mast cells which accumulate in the dermis of the skin as a response to some immunological or non immunological allergic response in the body.

Hives may appear at any point on the body once the trigger has happened. This may indicate a cause straight away. For example, if the rash appears on the arms or legs, a sun allergy may be responsible. The rash may have appeared underneath a new ring, which could indicate a reaction to a certain metal contained within the ring.

Hives are raised, often itchy, red welts on the surface of the skin. They are usually an allergic reaction to food or medicine. Hives caused by touching cold objects are often caused by infection and often stop after a person takes antibiotics. Doctors usually recommend avoiding aspirin, the most common drug cause of hives. In hives, which is also called urticaria, large red, raisM patches (wheals) appear suddenly on the skin, accompanied by itching. The patches can range up to the size of a half dollar or sometimes even larger.

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