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Nov 3, 2022 ... Hives (or urticaria) can have various causes – allergic reaction, infection, stress, overexposure to sun or heat. 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". Oct 3, 2024 ... Hives (urticaria) are raised, red, itchy welts. The majority of urticaria develop as a result of allergic reactions. Feb 12, 2021 ... How Long Do Hives Last? Some hives will come and go within a few hours. In other cases, hives will last for a few days. It depends on the immune ... Hives that last longer than six weeks or with recurring outbreaks over a six-week period are most commonly caused by viral or bacterial infections like ... Jan 20, 2020 ... What Are Hives and What Causes Them? Hives, medically known as urticaria, are a collection of red, raised skin bumps that may be associated with ... What is the treatment for hives? The best treatment for allergic hives is to avoid the allergic trigger. Non-allergic hives usually go away by themselves within ... Jan 25, 2025 ... Symptoms of Hives, Causes of Widespread Hives, Causes of Localized Hives, When to Call for Hives, Call 911 Now, Call Doctor or Seek Care Now. Some people get hives when they develop an infection like strep throat, a urinary tract infection, or COVID-19. Others get hives when they have a medical ... Jan 9, 2024 ... Hives are raised, itchy bumps that appear on the skin. They are caused by an allergic reaction or other factors, such as stress or infection.