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Urticaria, commonly known as hives, is a common skin reaction characterized by raised, intensely itchy, red or skin-colored welts (wheals) that appear suddenly on the skin. The welts can vary in size and often change location over a short period.
read more about urticaria hives ...Urticaria is triggered by the immune system releasing histamine and other chemicals into the bloodstream. This release is often a response to allergens like food, medication, or insect stings, but non-allergic triggers like cold, heat, or stress can also be factors. The histamine causes small blood vessels to leak fluid, which quickly accumulates beneath the skin's surface, leading to the sudden appearance of the characteristic raised welts that define the condition.
Symptoms are defined by severe itching and the characteristic appearance of raised, pink or red welts (wheals) on the skin. The rash often blanches (turns white) when pressed and appears in random locations across the body, typically lasting a few hours before fading. The welts can merge together to form large patches, and the intense itching is the main source of discomfort that drives patients to seek treatment.
Diagnosis is usually clinical, based on the appearance of the welts. Treatment focuses on identifying and avoiding the trigger and managing symptoms. Antihistamines are the standard treatment to block the release of histamine and reduce the swelling and itching. For severe or chronic cases, corticosteroids may be needed.
Urticaria frequently impacts eye health by causing localized swelling around the eyes. Hives can appear on the eyelids, causing them to swell severely and temporarily restricting vision. If the deeper tissue is affected, it is called angioedema, which can cause significant swelling of the eyelids and conjunctiva.
Necessary prevention strategies involve keeping a detailed log to identify specific triggers. Once triggers (foods, medications) are known, strict avoidance is the most effective way to prevent future outbreaks.
No, urticaria is a skin reaction caused by internal immune responses, not an infection, and is not contagious.
Yes, emotional stress can act as a non-allergic trigger for some forms of chronic urticaria.
Hives themselves are generally harmless, but if the swelling progresses to the throat (angioedema), it becomes a life-threatening medical emergency.
Seek emergency care if hives are accompanied by difficulty breathing or swelling of the lips and tongue. If hives appear around the eyes (periorbital urticaria), avoid rubbing, as the thin tissue can easily bruise or develop secondary infections from skin barrier breaks.
American Academy of Allergy Asthma & Immunology. Hives (urticaria) (aaaai.org). 2024.
Cleveland Clinic. Hives (Urticaria) (clevelandclinic.org). 2024.
StatPearls. Urticaria (ncbi.nlm.nih.gov). 2024.
Mayo Clinic. Chronic Hives (mayoclinic.org). 2024.