Hives
Posted on August 13, 2008
Filed Under Allergy |
Hives is an eruption of the skin resembling the one sparked by a stinging nettle, hence the word hives.
The plates red, raised, changing location during a single day, sometimes very quickly, and may even disappear completely a few hours or days and then reappear.
The itching and duration of hives are variable and may last a few minutes, sometimes a few hours and long weeks, months or years.The rash or hives acute giant
A crisis of hives often occurs in isolation evolving for a few hours or a few days.
This type of hives may involve 20% of the population.
One cause allergic can be found: In this case, medicines, foods, insect stings and latex, for example, can be involved.
The chronic urticaria
Hives sometimes lasts several weeks, several months or several years.
The term chronic urticaria is used to refer to any rash evolving for more than 6 weeks.
The allergy is only possible causes of chronic hives.
A viral infection, heat, cold water, the intense effort, the sun can cause a chronic urticaria
The search for the cause of chronic hives is difficult The causes are numerous making diagnosis complex.
It may take many weeks or many months.
Unfortunately, medicine can not find the origin of this type of hives that in 20% to 30% of situations as much as possible.
The major objective of doctors is to relieve the patient by prescribing one or more antihistamines and give advice when crises worse.
This treatment is usually prescribed for at least 4 to 6 weeks.
Among the causes of chronic urticaria
Allergies: they are seldom involved in this type of hives. They are more the cause of acute urticaria that extend a few hours to several days.
Some foods rich in histamine, such as chocolate, shellfish, tuna or strawberries for example, can aggravate chronic hives.
Medicines: aspirin, nonsteroidal anti-inflammatory non stéroidiens, morphine and codeine can aggravate hives
The viral or bacterial infections, parasites can also be the cause
An anomaly of the thyroid may also cause hives
The psychological dimension of a rash should not be underestimated.
The absence of Cause: The urticaria without cause found, called idiopathic urticaria, relate to more than 60% to 70% of chronic urticaria.
The urticaria physiquesUne physical urticaria can cause a chronic urticaria
The dermographisme
The dermographisme is triggered by contact with skin and can reproduce by rubbing the skin with a small edge plates hives appear at the place of friction.
Hives cholinergic
It is triggered by heat, stress or effort.
Hives delayed the pressure
Hives delayed the pressure resulting in oedema appearing after a heavy pressure on the forearm, for example, or on the shoulders, wearing a heavy object or under the feet after walking for a long time.
Hives cold
The water or cold air, rain, snow, rain, bathing in cool water can cause this type of hives.
More violent reactions such as abdominal pain, asthma attack or anaphylactic shock can occur
A test used in hospitals by applying an ice cube on the forearm can confirm the diagnosis.
This rash is usually idiopathic, without cause determined, or sometimes linked to a virus.
This type of hives must seek a blood abnormality, such as cryoglobulinemia.
It is necessary to be careful when swimming in the sea or a swimming pool and not to swim alone without being monitored.
It is necessary to be able to quickly take drugs, as corticosteroids or adrenaline to avoid the appearance of complications.
Take the advice of your doctor before taking a swim when the cold urticaria is suspected or diagnosed.
Hives to water
Hives appearing after contact with water is scarce. It reproduces by applying a wet compress on the skin for thirty minutes.
Hives solar
It occurs in the first minutes after exposure to the sun and disappear quickly after having put in the shade.
Take the advice of a doctor before sun exposure
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