+ Infographic textChronic spontaneous urticaria (CSU) is the medical term for hives that: Have no known cause Last a long time Chronic = Lasts for 6 weeks or longer Spontaneous = No obvious cause or trigger Urticaria = Red and itchy raised welts or patches on the skin (hives) What causes CSU? When your immune system detects a threat, it releases histamine and other inflammatory chemicals. Histamine can widen blood vessels, which can lead to skin swelling, itchiness and redness. What triggers hives? Common triggers of hives usually include: Allergies Bacterial infe...
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