What should you know about viral hives?

Hives are raised, itchy welts that can change shape or move to different areas. A viral illness may trigger them through immune activity, often alongside fever or cold symptoms, but a new medicine, food, heat, pressure, or contact exposure can produce a similar pattern. Individual welts often fade while new ones appear. [Hives](/conditions/urticaria/) covers the condition, while [Itchy Skin](/symptoms/itchy-skin/) and [Skin Rash](/symptoms/skin-rash/) describe common features.

Keep the skin cool, wear loose clothing, and avoid hot showers, rubbing, and known triggers while the episode settles. A clinician or pharmacist may advise an oral antihistamine; follow the product directions and check suitability if you are pregnant, treating a child, or taking other medicines. [Antihistamine Treatment](/treatments/medical-dermatology/oral-antihistamine-therapy/) explains this option. Do not stop a prescribed medicine without advice, but report a rash that began after a new drug.

Call emergency services for swelling of the tongue, lips, mouth, or throat; trouble breathing; wheezing; faintness; or difficulty swallowing. These can signal a severe allergic reaction even if the hives began during a viral illness. Seek prompt clinical advice for painful swelling, especially around the eyes or mouth, which may be [Angioedema](/conditions/angioedema/). Persistent or recurrent hives deserve a planned review.

Ask whether the timing fits a viral trigger, a new medicine, or another exposure; which antihistamine is suitable; and what symptoms mean emergency care. Describe fever, recent infections, foods, medicines, exercise, heat, and the speed of each flare.