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What causes hives?

Dr. Doris Day, MD
Dermatology
Those itchy red bumps on your skin are a sign that your immune system is overreacting, says dermatologist Dr. Doris Day. Watch this video to learn more about what causes hives.
Dr. Mehmet Oz, MD
Cardiology (Cardiovascular Disease)
Hives are caused by allergic reactions to various items, which can differ for each person. Allergens that can cause hives include certain foods, various medications, pollen and others.

Hives are the result of an allergic reaction to something, such as a food, medication, bug bite, or other substance. For some reason, the body finds these things threatening, and it releases chemicals that irritate the skin. Other disorders or infections can sometimes cause hives, too.

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.