True coffee or cocoa allergy is rare. More commonly, reactions to coffee are the result of a food intolerance or allergy to an ingredient in it. Coffee contains .3 grams of protein per eight ounce cup. When such an allergy occurs,it may cause hives,swelling,itching,hoarseness of voice and difficulty in breathing and life threatening anaphylaxis.
Numbness,swelling and drooping cannot be explained by coffee allergy.I think that it can be due to Bell’s palsy manifestation.Best would be to consult a physician/neurologist.
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I would have to agree that a person is more likely to be "sensitive" to things with caffeine, rather than having a "true" allergy, but the thing with sensitivities is that you still need to avoid the items like they are allergies in order to stop having symptoms.
While I have tested for things that I know I'm sensitive to and the tests come back negative for "true" allergies, I know I can't tolerate coffee, black tea, green tea or white tea. Some people tried to tell me that white tea was so different. It's not, because it all comes from the same plant.