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Peppermint oil can indeed cause an allergic reaction in those sensitive to it, whether used internally or externally. In rare cases it can even cause anaphylactic shock when taken internally, causing difficulty swallowing and breathing, tongue and lip swelling, and ulcers or blisters in the mouth. Anyone showing symptoms of anaphylaxis after consuming peppermint should seek medical help immediately. Peppermint oil has also caused dermatitits when used topically, leaving a rash or hives.
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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.