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What is an allergic reaction?

Dr. Jeanne Morrison, PhD
Family Practitioner
A allergic response is a hypersensitive immune reaction to a substance that normally is harmless or would not cause an immune response in most people. An allergic response may cause harmful symptoms such as itching or inflammation or tissue injury.

This answer is based on source information from the National Cancer Institute.
An allergic reaction is the response of the immune system to a foreign substance that enters the body.

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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.