Urticaria can usually be diagnosed by examining the distinctive red rash.
If you havelong-term (chronic) urticaria, a number of tests may be needed to identify the underlying cause.
Your GP can usually diagnose acute urticaria by examining the rash.
They'll also ask you some questions to find out what triggered your symptoms, including:
In around half of all cases of acute urticaria,a cause can't be identified.
If your GP thinks your symptoms are caused by an Indoor allergy , you may have to go to an allergy clinic.
Allergy testing may be needed to find out if you're allergic to suspected triggers for urticaria.
If your urticaria lasts for more than six weeks, it's very unlikelyto be caused by an allergy, so allergy tests aren't usually recommended.
However, your GP should ask about anything that makes your urticaria worse, such as:
You may also be referred for a number of tests to find out if there's an underlying cause of your chronic urticaria. These tests may include:
Urticaria also known as hives, weals, welts or nettle rash is a raised, itchy rash that appears on the skin. It may appear on one part of the body or be spread across large areas.
Urticaria occurs when histamine and other chemicals are released from under the skin's surface, causing the tissues to swell.
Short-term urticaria can be diagnosed by examining the distinctive red rash. If you have severe or long-term urticaria, you may need to have tests to identify the underlying cause.