Allergic Reaction Topic Guide
Allergic Reaction: An allergic reaction is an overreaction to a harmless substance. Symptoms and signs of an allergic reaction include hives, rashes, swelling, itching, wheezing, nausea, and even anaphylactic shock in severe reactions. Treatment involves avoiding triggers, taking oral antihistamines, applying antiinflammatory steroid creams, and using an EpiPen.
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Poison Ivy, Oak, and Sumac More than half the people in the United States are sensitive to poison ivy, poison oak, and poison sumac. If you are sensitive, you can develop an itchy, blistering rash ...
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