Hives
Hives are raised, often itchy areas of swollen skin, also called urticaria. They may follow an allergic reaction, but infections, stress, or other triggers can also contribute. The appearance alone does not identify the cause.
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BEYOND THE DEFINITION
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Understanding the basics can help you ask.
Hives can form raised patches in different shapes and sizes, in one area or across the body. They may itch, sting, or burn. Color changes can be harder to see on darker skin, so the raised texture and sensation are also useful to describe. [2]
Food and medicine reactions are possible triggers, but so are infections, heat, cold, pressure, and sweating. Repeated episodes do not automatically identify a food allergy. Note the timing and circumstances rather than assuming that the last thing you ate caused the rash. [2]
ALSO WORTH KNOWING [1]
Hives with breathing trouble can be an emergency. Seek emergency help instead of waiting for virtual care. [1]
THE CLINICAL CONVERSATION
Seek prompt medical advice if hives keep returning, spread, or occur with fever or swelling beneath the skin. Sudden mouth or throat swelling, trouble breathing or swallowing, or fainting requires emergency care. A routine virtual appointment is not the right setting for those symptoms. [2]
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Prepare for a care conversationTHREE QUESTIONS TO BRING
A FEW STRAIGHT ANSWERS
General information to help you prepare for a conversation about your own health.
Yes. A pharmacist or clinician should know about ongoing conditions before recommending an antihistamine. Some options may not suit everyone, including certain people with existing health problems. [2]
No. Food or medicine allergies can cause hives, but infection and stress are other possibilities. A clinician considers the circumstances around an episode rather than assuming one particular cause. [1]
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References checked November 7, 2026. This content has not been clinically reviewed for Northguard.
