Allergy & Auto_Immunity

Urticaria (also known as hives, welts or nettle rash) is a raised, itchy rash that appears on the skin. The rash can be limited to one part of the body or spread across large areas of the body.

The affected area of skin will typically change within 24 hours, and usually the rash will settle within a few days. If it clears completely within six weeks, it is known as acute urticaria.


Urticaria happens when a trigger causes high levels of histamine and other chemical messengers to be released in the skin.

These substances cause the blood vessels in the affected area of skin to open up (often causing redness or pinkness) and become leaky. This extra fluid in the tissues causes swelling and sometimes itchiness.

Histamine is released for a wide range of reasons, including:

  • An allergic reaction to substances
  • Exposure to cold or heat
  • Infection
  • The direct effect of certain chemicals which can be found in some types of food and medications, such as Non-Steroidal Anti-Inflammatory Drugs (NSAID).


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