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    Hives/Urticaria

    Urticaria

    What are hives? — Hives are raised, red patches of skin that are usually very itchy (picture 1). They can happen because of an allergy or other causes. In most cases, hives come and go within a few hours. But they can show up again and again in some people.
    Some people who get hives also get a condition called "angioedema." Angioedema is puffiness or swelling. It usually happens in the face, eyelids, ears, mouth, hands, feet, or genitals.
    Some people who get hives or angioedema are having a dangerous allergic reaction. See a doctor or nurse right away if you suddenly get hives or get puffy and also have any of these symptoms:
    Trouble breathing
    Tightness in the throat
    Nausea and vomiting
    Cramps or stomach pain
    Passing out
    Why did I get hives? — If you just got hives for the first time, you might have a new allergy to something. People can get hives because of allergies to:
    Medicines, such as antibiotics or aspirin
    Foods, such as eggs, nuts, fish, or shellfish
    Something they touched, such as a plant, animal saliva, or latex
    Insect stings
    If your hives are caused by an allergy, you will need to avoid whatever you are allergic to.
    Hives can also be caused by:
    Infections
    Having cold air or water on the skin
    Having something press or vibrate against the skin
    Changes in body temperature (such as when you cool down after a hot shower or a work out)
    If you have had hives on most days for more than 6 weeks, you may have "chronic hives." Chronic hives are not caused by an allergy. In most cases, doctors do not know what causes chronic hives.
    If you have chronic hives, you will probably need to take medicines every day to control them. Luckily, chronic hives do usually go away with time.
    How are hives treated? — You might not need treatment. Hives usually go away in a few days or weeks, even if you do not get treated. If you have hives for the first time, talk to your doctor or nurse about whether or not you need treatment. If you do, the first step will be to figure out if anything triggered the hives. If so, you will need to avoid that trigger.
    To relieve itching, you can take medicines called antihistamines. These are the same medicines people usually take for allergies.
    If you have severe hives or your hives will not go away, your doctor or nurse might suggest that you take medicines called steroids for a short time. Steroids work well to relieve itching and reduce swelling. But you should not take them for long, because they can cause serious side effects. These are not the same as the steroids some athletes take illegally.
    All topics are updated as new evidence becomes available and our peer review process is complete.
    This topic retrieved from UpToDate on: Mar 30, 2020.
    Topic 15456 Version 7.0
    Release: 28.2.2 - C28.105
    © 2020 UpToDate, Inc. and/or its affiliates. All rights reserved.

    Popular drugs
    5 popular Hives/Urticaria drugs

    Name

    Hives

    Body systems

    Dermatologic,Emergency Medicine

    The Basics

    Written by the doctors and editors at UpToDate
    What are hives? — Hives are raised, red patches of skin that are usually very itchy (picture 1). They can happen because of an allergy or other causes. In most cases, hives come and go within a few hours. But they can show up again and again in some people.
    Some people who get hives also get a condition called "angioedema." Angioedema is puffiness or swelling. It usually happens in the face, eyelids, ears, mouth, hands, feet, or genitals.
    Some people who get hives or angioedema are having a dangerous allergic reaction. See a doctor or nurse right away if you suddenly get hives or get puffy and also have any of these symptoms:
    Trouble breathing
    Tightness in the throat
    Nausea and vomiting
    Cramps or stomach pain
    Passing out
    Why did I get hives? — If you just got hives for the first time, you might have a new allergy to something. People can get hives because of allergies to:
    Medicines, such as antibiotics or aspirin
    Foods, such as eggs, nuts, fish, or shellfish
    Something they touched, such as a plant, animal saliva, or latex
    Insect stings
    If your hives are caused by an allergy, you will need to avoid whatever you are allergic to.
    Hives can also be caused by:
    Infections
    Having cold air or water on the skin
    Having something press or vibrate against the skin
    Changes in body temperature (such as when you cool down after a hot shower or a work out)
    If you have had hives on most days for more than 6 weeks, you may have "chronic hives." Chronic hives are not caused by an allergy. In most cases, doctors do not know what causes chronic hives.
    If you have chronic hives, you will probably need to take medicines every day to control them. Luckily, chronic hives do usually go away with time.
    How are hives treated? — You might not need treatment. Hives usually go away in a few days or weeks, even if you do not get treated. If you have hives for the first time, talk to your doctor or nurse about whether or not you need treatment. If you do, the first step will be to figure out if anything triggered the hives. If so, you will need to avoid that trigger.
    To relieve itching, you can take medicines called antihistamines. These are the same medicines people usually take for allergies.
    If you have severe hives or your hives will not go away, your doctor or nurse might suggest that you take medicines called steroids for a short time. Steroids work well to relieve itching and reduce swelling. But you should not take them for long, because they can cause serious side effects. These are not the same as the steroids some athletes take illegally.
    All topics are updated as new evidence becomes available and our peer review process is complete.
    This topic retrieved from UpToDate on: Mar 30, 2020.
    Topic 15456 Version 7.0
    Release: 28.2.2 - C28.105
    © 2020 UpToDate, Inc. and/or its affiliates. All rights reserved.

    What are other common names?

    Acute Urticaria,Allergic Reaction,Chronic Urticaria,Cold Urticaria,Delayed Pressure Urticaria,Dermatographism,Drug Allergy,Heat Urticaria,Hives,Hives, Chronic,Physical Urticaria,Solar Urticaria,Spontaneous Urticaria,Urticaria,Vibratory Urticaria/Angioedema,Welts

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    This information is not specific medical advice and does not replace information you receive from your health care provider. This is only a brief summary of general information. It does NOT include all information about conditions, illnesses, injuries, tests, procedures, treatments, therapies, discharge instructions or life-style choices that may apply to you. You must talk with your health care provider for complete information about your health and treatment options. This information should not be used to decide whether or not to accept your health care provider's advice, instructions or recommendations. Only your health care provider has the knowledge and training to provide advice that is right for you.The use of UpToDate content is governed by the UpToDate Terms of Use. ©2020 UpToDate, Inc. All rights reserved.

    Copyright

    © 2020 UpToDate, Inc. and/or its affiliates. All rights reserved.