Inflammation of the blood vessels, or vasculitis, can also cause hives. These hives are more painful than itchy, may leave a bruise on the skin and often last more than a day. Find answers with an allergist. Hives Hives, also known as urticaria, affects about 20 percent of people at some time during their lives. On this page. Whether your allergist suggests a treatment available only by prescription or an over the counter treatment will depend on several factors, including how uncomfortable the hives are making you.
Find expert care. Find an Allergist. Symptoms Symptoms can last anywhere from minutes to months — or even years. While they resemble bug bites, hives also known as urticaria are different in several ways: Hives can appear on any area of the body; they may change shape, move around, disappear and reappear over short periods of time.
Allergist Stanley Fineman, MD. Is It Hives or Angioedema? The following symptoms may indicate angioedema: Swelling in the eyes or mouth Swelling of the hands, feet or throat Difficulty breathing, stomach cramps or swelling of the lining of the eyes The best way to identify your symptoms is to talk to an allergist who can diagnose and treat both hives and angioedema.
Diagnosis In some cases, the trigger is obvious — a person eats peanuts or shrimp , and then breaks out within a short time. Management and Treatment Researchers have identified many — but not all — of the factors that can cause hives. Here are a few of the most common causes: Some food especially peanuts, eggs, nuts and shellfish Medications, such as antibiotics especially penicillin and sulfa , aspirin and ibuprofen Insect stings or bites Physical stimuli such as pressure, cold, heat, exercise or sun exposure Latex Blood transfusions Bacterial infections, including urinary tract infections and strep throat Viral infections, including the common cold, infectious mononucleosis and hepatitis Pet dander Pollen Some plants Antihistamines — available either over the counter or by prescription — are a frequently recommended treatment for hives.
Rubbing or scratching: Avoid harsh soaps. Frequent baths may reduce itching and scratching — beneficial because itching and scratching can make the hives feel worse. Constant pressure: Avoid tight clothing. Pressure hives can be relieved by wearing loose-fitting clothes. Temperature: If you develop hives when exposed to cold, do not swim alone in cold water and always carry an epinephrine auto-injector.
Avoid exposure to cold air and use a scarf around your nose and mouth in cold weather. If you must be out in the cold, wear warm clothing. Sun exposure: Wear protective clothing; apply sunblock. Medications: Notify your physician or pharmacist immediately if you suspect that a specific medication is causing your hives. Chronic hives Some cases of hives last for more than six weeks and can last months or years.
Physical urticaria In physical urticaria, the hives have a physical cause, such as exposure to heat, cold or pressure. Common triggers include: Rubbing or scratching. Severe angioedema can be life-threatening if swelling of the tongue or in the throat blocks the airway. Mayo Clinic does not endorse companies or products. Advertising revenue supports our not-for-profit mission. This content does not have an English version.
This content does not have an Arabic version. Overview Hives on white skin Open pop-up dialog box Close. Hives on white skin Hives may be accompanied by angioedema, which can cause swollen welts that appear reddish on white skin. Hives on brown skin Open pop-up dialog box Close. Hives on brown skin Hives, also known as urticaria, causes itchy welts that may be triggered by exposure to certain foods, medications or other substances.
Angioedema Open pop-up dialog box Close. Angioedema Angioedema may cause large welts below the surface of the skin, particularly around the eyes and lips. Request an Appointment at Mayo Clinic. Share on: Facebook Twitter. Show references AskMayoExpert. Mayo Clinic; Kang S, et al. Urticaria and angioedema. They can also change often. The most common cause of hives all over the body is viral infections.
Research has confirmed this. Other symptoms such as a fever, cough or diarrhea are also present. The hives may last 3 days. This is not an allergy. Bacterial Infection. Some bacterial infections can also cause hives. A common example is Strep. Hives are also seen with bladder infections.
UTIs Drug Reaction. An example is a penicillin rash. Most rashes that start while taking an antibiotic are viral rashes. Food Reaction. May be an allergy or a coincidence. The specific cause of hives is rarely identified. There are many different antihistamines that are used to treat hives. Very commonly patients are given a few antihistamines at a time to treat the hives.
Sometimes medications such as steroids, antileukotrienes, and cyclosporine are needed to control hives. When the medications are discontinued the hives can return. Patients should have us monitor their progress every one to two months initially. Find a Doctor Find a Doctor. Adult: Pediatric: What are hives, or urticaria? How long can hives last?
What are the different types of hives?
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