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- DictionaryUr·ti·car·i·a/ˌərdəˈkerēə/
noun
- 1. a rash of round, red welts on the skin that itch intensely, sometimes with dangerous swelling, caused by an allergic reaction, typically to specific foods.
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In physical urticaria, the hives have a physical cause, such as exposure to heat, cold or pressure. Common triggers include: Rubbing or scratching. This is the most frequent cause of physical urticaria. Symptoms appear within a few minutes in the place that was rubbed or scratched and typically last less than an hour.
Urticaria results from the release of histamine, bradykinin, kallikrein, and other vasoactive substances from mast cells and basophils in the superficial dermis, resulting in intradermal edema caused by capillary and venous vasodilation and occasionally caused by leukocyte infiltration. The process can be immune mediated or nonimmune mediated.
- Julia Benedetti
- What Is Urticaria?
- Symptoms
- Treatment
Hives (urticaria) are a reaction that causes red, itchy, swollen welts on the skin. Typically, hives develop as an allergic reaction to food, drugs or other substances. Also, urticaria can occur during viral infections. Stress and sun exposure can be triggers as well. They come suddenly and go away just as suddenly.
Red itchy welts anywhere in the body that come and go suddenly are urticaria. In rare cases, hives are part of a severe allergic reaction, called anaphylaxis. Signs of anaphylaxis include: 1. Difficulty breathing 2. Confusion 3. Rapid heart beat 4. Swelling of the lips, tongue, throat 5. Wheezing 6. Slurred speech 7. Confusion 8. Bluish skin (cyano...
Avoiding any known causes and triggers of urticaria is the best way to prevent them. If the hives are caused by an allergy, antihistamines — medications that counter the immune system’s chemicals released against the allergen — may be given.
Jun 25, 2023 · Stress urticaria: This is a type of chronic hives caused by emotional stress. With that said, the condition is hard to define as stress is only presumed to be the cause. The weals tend to be larger and can occur on any part of the body. Vibratory urticaria: Vibrations, such as clapping or a bumpy car ride, can cause hives in some people.
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Jun 1, 2017 · Urticaria, with or without angioedema, can be classified as acute or chronic. Urticaria that recurs within a period of less than six weeks is acute. Recurring chronic urticaria lasts longer than ...
Causes. When you have an allergic reaction to a substance, your body releases histamine and other chemicals into the blood. This causes itching, swelling, and other symptoms. Hives are a common reaction. People with other allergies, such as hay fever, often get hives. Angioedema is swelling of the deeper tissue that sometimes occurs with hives.
Apr 27, 2023 · HIVES OVERVIEW. "Urticaria" is the medical term for hives. Hives are raised or puffy areas of the skin that itch intensely ( picture 1 ). Hives are a very common condition. About 20 percent of people have hives at some time during their lives. Hives develop when there is a reaction that activates immune cells in the skin called mast cells.
