What are hives?
Hives, also known as urticaria, are a skin reaction that causes itchy, red welts or hives on the skin. These can appear anywhere on the body and can move around.
Is hives dangerous and a sign of a serious illness?
Generally, hives (urticaria) are not dangerous. They are simply a reaction in the top layer of the skin to something that irritated the body at that moment. The itching can be extremely bothersome, but it is not dangerous.
However, in some cases, swelling of the mucous membranes in the mouth, throat, genital area, abdomen, and intestines may occur. This can potentially be dangerous if it causes airway obstruction. This is very rare. If this happens, it is important to call emergency services immediately (in Norway, dial 113) for prompt assistance.
I had hives once, can I get them again?
Yes, it is possible to get hives again if you have had them before. It is often triggered by the same cause, so if you had hives after eating apples, being bitten by a mosquito, or having a streptococcal throat infection, for example, it is likely that you may develop a rash if exposed to the same trigger again. Therefore, it is advisable to try to avoid it if possible.
Is there a vaccine against hives (urticaria)?
Generally, no. Urticaria is often triggered by factors such as heat, cold, infection, or food, for which there is no vaccine. However, if you have developed hives after contact with grass, for example, it may be possible to receive a vaccine for grass allergy.
Can hives go away on their own without treatment, or do I need to see a doctor for medication?
In most cases, hives resolve on their own, but the intense itching leads people to seek medical help to find relief.
Is hives hereditary?
A person who has had hives often has slightly more sensitive skin, which can be inherited. However, just because a parent has had hives does not necessarily mean their child will have the same condition.
What causes hives?
Hives can be triggered by a variety of factors, including:
Allergies (food, medication, insect stings)
Infections
Heat or cold
Stress
Physical irritation
Underlying medical conditions
How long do hives last?
Hives can last from a few hours to several weeks. Acute urticaria lasts less than 6 weeks, while chronic urticaria can last for months or years.
When should I see a doctor?
See a doctor if:
✔️ The hives are severe or persist for more than a few days
✔️ You have swelling in your face or neck
✔️ You have breathing difficulties