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Find out about hives (also called urticaria), which is a raised, itchy rash that's usually caused by a reaction to things like food, pollen, insect bites or chemicals.
- Antihistamines
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- Angioedema
Types of angioedema; Cause Type; Angioedema caused by an...
- Rashes in Babies and Children
Hives rash on the thigh of a person with dark brown skin....
- Steroid Tablets
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- Antihistamines
- What Are Hives?
- What Causes Hives?
- Types of Hives
- Hives Symptoms
- Diagnosing Hives
- Hives Treatment
- Are Hives Serious?
- How Long Do Hives Last?
- Complications of Hives
Hives (or urticaria) is an itchy rash caused by tiny amounts of fluid that leak from blood vessels just under the skin surface. A trigger causes cells in the skin to release chemicals such as histamine. The chemicals cause fluid to leak from tiny blood vessels under the skin surface. The fluid pools to form wheals or welts. The chemicals also cause...
Hives can be triggered by a number of different physical causes. The reason why a rash appears in affected people is not clear. The physical stimulus causes a release of histamine and other chemicals, which causes the rash. Some known triggers include: 1. A physical stimulus. Where this is the case the condition is calledinducible urticaria. In thi...
Hives can be classed as follows: 1. Acute - if it develops suddenly and lasts less than six weeks. Most cases last 24-48 hours. In some cases the rash only lasts a few hours. About 1 in 6 people will have at least one bout of hives in their lives. It can affect anyone at any age. Some people have recurring bouts of acute hives. 2. Chronic - if it p...
An itchy rash is the main symptom of hives (urticaria). The rash can appear anywhere on the body. Small, raised areas called wheals develop on the skin. The wheals look like mild blisters and are itchy. Each wheal is white or red and is usually surrounded by a small red area of skin which is called a flare. The wheals are commonly 1-2 cm across but...
Are any tests needed?
Usually no tests are needed. The rash is very typical and is easily recognised as hives by doctors. In a few cases it is clear what caused the rash from the events leading up to it, for example if recently stung by a nettle or starting new medication.
A symptom diary
A symptom diary may be helpful in working out if there is a specific cause. A diary might also show if the rash relates to stress, exercise or sunlight. It may help rule out certain causes.
Skin-prick allergy tests
In some cases, if it appears to be related to an allergy, tests such as skin-prick allergy testsmay be helpful. Tiny quantities of substances which might cause an allergy are placed on the skin in a special order. If the skin reacts, there may be an allergy to that substance.
Often no treatment is necessary, as the rash commonly goes within 24-48 hours. A cool bath or shower may ease the itch. Calamine lotion or menthol 1% in aqueous cream can help with itching, although if it is left on for too long the itch may come back. These can be bought without a prescription. Once it is clear what causes the hives, it may be pos...
Usually not. The rash is itchy but normally fades within a day or so and causes no harm. Most people with hives (acute urticaria) do not feel too unwell unless they have a cold or flu that is triggering the rash. The cause of the rash is not known in more than half of cases and it is commonly a one-off event. However, hives may be more serious in t...
Inducible urticaria most commonly occurs in healthy young adults. As a rule, hives triggered by physical stimuli tend to improve and become less troublesome with time (often going, or being much less troublesome, after 2-5 years). Acute hives usually last less than six weeks. Most cases last 24-48 hours and in some cases the rash only lasts a few h...
There are usually no serious complications, but the itch can be very annoying and difficult to ignore. If skin is scratched excessively then there is a risk of infection.
Hives – also called urticaria or nettle rash – is a bumpy red rash that’s typically caused by an immune response, like an allergic reaction. In this article, we’ll explain everything you need to know about hives, from their causes, to how to beat them.
The main symptom of hives (urticaria) is a rash. The rash may: be raised. be very itchy. be on one part of the body. spread over large areas. range is size from a few millimetres to the size of a hand. change in appearance within 24 hours. The image shows a hives rash on the side of the stomach.
The more common type of urticaria rash (hives) lasts up to 24 hours, produces larger wheals and may not completely clear for several days. It sometimes occurs together with swelling of various parts of the body (angioedema) – typically the face, hands, and feet, although anywhere may be affected.
Hives, also known as urticaria, refer to raised, red wheals or welts on your skin that are very itchy and can be accompanied by deep tissue swelling (angioedema). Hives usually disappear within 24 hours but can reappear on another area of the skin, while the angioedema usually takes up to three days to resolve.
People also ask
What is the medical name for hives?
How long does a hive last?
What is a hive rash?
How can I prevent hives?
What are hives – urticaria or nettle rash?
What causes hives (urticaria)?
Urticaria is characterised by very itchy weals (hives), with or without surrounding erythematous flares. The name urticaria is derived from the common European stinging nettle Urtica dioica. Urticaria can be acute or chronic, spontaneous or inducible.
