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Can one allergy lead to another?

I had an allergic reaction to peanuts about a week ago so I'm staying away from them. I've always been allergic to chocolate though. Are they connected? If you are allergic to one food can it lead to an allergy to another food?
It is not the case that one allergy leads to another, in the sense that one food allergy 'triggers' an allergy to another food. However, it is the case that people who are allergic to one food do tend to be allergic to other foods as well. The reason for this probably mostly has to do with the individual genetics of that person, which have predisposed them to be 'allergic' to various foods or other substances in the environment. If you are allergic to peanuts, or to any other food, it is important to talk with either your primary care doctor or an allergy doctor about this issue, if you have not done this already. This is because certain types of allergic reactions can be quite serious, even life threatening. For this reason, most people who have had a serious allergic reaction to a food like peanuts should carry an emergency allergy pen with them at all times in case they come into accidentally contact with a food containing the allergen. Your doctor will be able to assess the severity of your reaction and help determine if you need this prescription. They will also be able to give you more general advice about which foods to avoid.
This answer is for general informational purposes only and is not a substitute for professional medical advice.
If you think you may have a medical emergency, call your doctor or (in the United States) 911 immediately. Always seek the advice of your doctor before starting or changing treatment. Medical professionals who provide responses to health-related questions are intended third party beneficiaries with certain rights under Zocdoc’s Terms of Service.

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