are hives bacterial or viral?
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In fact, viral infections cause more than 80 percent of all cases of acute hives in children. A variety of viruses can cause hives (even routine cold viruses). The hives seem to appear as the immune system begins to clear the infection, sometimes one week or more after the illness begins.
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Hives are relatively uncommon in dogs. The most frequent causes are insect bites or stings, shampoos, and medications. Other causes include contact with toxic plants or chemicals. Friction, sunlight, heat, exercise, stress, and genetic abnormalities may cause or intensify the rash.
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Hives are a red, raised, itchy skin rash that is sometimes triggered by an allergen. An allergen is something that produces an allergic reaction. It is also known as urticaria, welts, weals, or nettle rash. When an allergic reaction occurs, the body releases a protein called histamine.
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An allergic reaction is the single most common cause for an outbreak of hives. It can happen to anyone at any time. Some children with allergies seemingly outgrow them, and adults can develop them almost out of nowhere. Food allergies (most commonly an allergy to citrus fruits) will cause hives.
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Hives, also known as urticaria, is a sudden-onset skin reaction resulting in red or white welts of varying sizes. As the reaction progresses, the welts appear and diminish. The welts are also known as wheals.
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No one really knows what causes CIU. They do know that heat, cold, alcohol, exercise, tight clothes and nonsteroidal anti-inflammatory medicines (ibuprofen, aspirin) may make it worse. CIU is not life threatening. But sudden hives can be one of the symptoms of a severe allergic reaction.
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Hives — also referred to as urticaria — are welts on the skin caused by an itchy rash. Hives can appear on any part of the body and are often triggered by an allergic reaction. Hives aren't contagious, meaning you won't develop them on your skin by touching hives on another person.
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Hives caused by stress Stress can trigger an outbreak of hives that can make up a stress rash. Hives are raised, red-colored spots or welts. They vary in size and can occur anywhere on the body. Areas affected by hives can feel itchy.
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Many people think that hives and rashes are the same, but that's not exactly accurate. Hives are a type of rash, but not every rash is caused by hives. If you're concerned about your skin, it's important to know when a rash is caused by hives and when it might be caused by something else.
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"Urticaria" is the medical term for hives. Hives are raised areas of the skin that itch intensely and are red with a pale center (picture 1). Hives are a very common condition. About 20 percent of people have hives at some time during their lives.
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Hives Linked to Underlying Autoimmune Disease Hives are also associated with having an underlying autoimmune disease. Hives have been linked to thyroid disease, rheumatoid arthritis, systemic lupus erythematosus, Sjögren's syndrome, celiac disease, Raynaud's syndrome, vitiligo, and type 1 diabetes.
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In about half of patients with chronic idiopathic hives, the explanation is that body's immune system is, in a sense, overactive. The urticaria is "autoimmune". The immune system is attacking the normal tissues of the body and causing hives as a result.
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Hives usually cause itching, but may also burn or sting. They can appear anywhere on the body, including the face, lips, tongue, throat, or ears. Hives vary in size (from a pencil eraser to a dinner plate), and may join together to form larger areas known as plaques.
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Urticaria (hives) are red, itchy, raised areas of the skin that can range in size and appear anywhere on your body. Angioedema is a swelling of the deeper layers of the skin that often occurs with hives. Atopic dermatitis (eczema) is a scaly, itchy rash that often affects the face, elbows and knees.
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The main feature distinguishing chronic hives from more serious skin disorders is whether the welts are filled with fluid. If the red bumps are itchy, inflamed, and filled with fluid, the condition is most likely hives.
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What are the different kinds of hives? Hives fall into two categories on the basis of the time they have been present: acute urticaria (ordinary hives, which resolve after six to eight weeks) and chronic idiopathic urticaria (that continues longer than six to eight weeks).
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Urticaria (hives) is an acute, localized type I hypersensitivity reaction associated with pruritus. II. Angioedema is similar to urticaria but involves the deeper subcutaneous tissues around the head and extremities, without producing pain or pruritus.