Quick read
Key points
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Hives (urticaria) are raised, itchy welts on the skin, often appearing suddenly and sometimes moving around the body over hours. They're commonly caused by an allergic reaction to food, medication, or insect stings, though they can also be triggered by infections, stress, or physical factors like heat, cold, or pressure on the skin.
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Topic-specific prevention and risk reduction will be added during the article-specific evidence audit.
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Hives last longer than six weeks (chronic hives)
01 · Know
What is Hives?
Hives (urticaria) are raised, itchy welts on the skin, often appearing suddenly and sometimes moving around the body over hours. They're commonly caused by an allergic reaction to food, medication, or insect stings, though they can also be triggered by infections, stress, or physical factors like heat, cold, or pressure on the skin.
Most hives resolve within a day or two, especially once any trigger is identified and avoided, and antihistamines can help ease itching and speed resolution. Hives lasting more than six weeks (chronic hives) may need further investigation.
02 · Understand
Clinical context
Hives often move around the body, unlike many other rashes
A distinctive feature of hives is that individual welts often disappear within hours and new ones appear elsewhere, unlike many other rashes that stay in one place — this pattern can help distinguish hives from other skin conditions.
03 · Act
When to See a Doctor
- 1Hives last longer than six weeks (chronic hives)
- 2You're unable to identify a trigger and hives keep recurring
- 3Hives are significantly affecting your sleep or daily life
- 4You'd like to discuss allergy testing to identify a specific trigger
04 · Prevent & manage
Practical steps
Identify and Avoid the Trigger If Possible
If you can identify what triggered your hives — a specific food, medication, or exposure — avoiding it in future is the most effective way to prevent recurrence.
- 1Take an antihistamine.This can help ease itching and may speed up resolution of hives.
- 2Avoid known triggers.If you can identify a specific cause, avoiding it helps prevent future episodes.
- 3Avoid scratching.This can worsen irritation, even though hives are often very itchy.
- 4Wear loose, breathable clothing.This can help reduce irritation, particularly if pressure or heat seems to trigger your hives.
- 5See a doctor for chronic or recurrent hives.This helps investigate any underlying cause and discuss further treatment options.
Evidence
References
BarnMD Health Intelligence uses authoritative and clinically relevant sources appropriate to the topic. References are shown so readers can inspect the evidence directly.
- HSE: Hives ↗
Medical information notice
Health education, not individual medical advice
BarnMD Health Library provides general health education for public health literacy. Reading this article does not establish a doctor-patient relationship and this information is not a diagnosis, prescription, or personalised treatment plan. If you have symptoms or concerns about your health, seek appropriate advice from a qualified healthcare professional. If you develop emergency warning signs, seek urgent or emergency medical attention.
BarnMD Bottom Line
Hives are common and usually resolve within a day or two, particularly once any specific trigger is identified and avoided.
Hives with breathing difficulty or facial swelling need emergency care immediately, as this can indicate a severe allergic reaction.