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Hives FAQ

Hives FAQ

What causes hives?

The phenomena itself is caused by a histamine reaction. With regards to the source of the reaction, often it cannot be traced. Although there are many similarities and connections to allergies, allergy testing is rarely helpful in identifying a cause.

Why do hives move so quickly?

Rapid onset and disappearance, and movement of the rashes are one of the main distinguishing features of hives. The rash is caused by mast cells leaking histamine, which causes the raised rashes. These can occur in different areas, thus "moving" the rashes quickly.

When should I seek medical treatment?

For the most part, hives itself do not require any medical treatment. If the itch or appearance is disturbing you, antihistamines that are available over the counter can help to counteract the hives. One disadvantage of antihistamines is that have the side-effect for making one drowsy, which can be dangerous in certain circumstances. If you notice any of the more serious complications of allergies such as breathing problems, however, this needs to be treated as an emergency.

What is the difference between angioedema and hives?

In angioedema, the swelling occurs deeper in the skin than in hives, and is often the result of a more severe allergic reaction. If angioedema occurs in the throat, it can be considered a medical emergency. Hives rarely cause any complications.

The doctor cannot identify the cause of my hives. What can I do?

In many cases, the cause is unknown. Although this makes prevention difficult, generally, hives will run their course within 6 to 8 weeks. If it persists for longer than this, than contact your doctor. In the meantime, antihistamines can help you mitigate the itch.

 
     
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