Urticaria causas



Keywords: urticaria causas
Description: Hives, also known as urticaria, are red and sometimes itchy bumps on your skin. Learn about the hives symptoms, diagnosis and treatment here.

Hives, also known as urticaria, affects about 20 percent of people at some time during their lives. It can be triggered by many substances or situations and usually starts as an itchy patch of skin that turns into swollen red welts. The itching may be mild to severe. Scratching, alcoholic beverages, exercise and emotional stress may worsen the itching.

  • Hives can appear on any area of the body; they may change shape, move around, disappear and reappear over short periods of time.
  • The bumps - red or skin-colored “wheals” with clear edges - usually appear suddenly and go away just as quickly.
  • Pressing the center of a red hive makes it turn white - a process called “blanching.”

There are two types of hives - short-lived (acute) and long-term (chronic). Neither is typically life-threatening, though any swelling in the throat or any other symptom that restricts breathing requires immediate emergency care.

Chronic hives occur almost daily for more than six weeks and are typically itchy. Each hive lasts less than 24 hours. They do not bruise nor leave any scar.

If your hives last more than a month or if they recur over time, see an allergist. who will take a history and perform a thorough physical exam to determine the cause of your symptoms. A skin test and challenge test may also be needed to identify triggers.

Therapies range from cool compresses to relieve itching to prescription antihistamines and other drugs, such as anti-inflammatory medications and medications that may modify your immune system.

Angioedema - swelling of tissue beneath the surface of the skin - can be mistaken for or associated with hives. It can be caused by allergic reactions, medications or a hereditary deficiency of some enzymes. The following symptoms may indicate angioedema:

  • Swelling in the eyes or mouth
  • Swelling of the hands, feet or throat
  • Difficulty breathing, stomach cramps or chemosis (swelling of the lining of the eyes)






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