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Are people born with food allergies or are they developed over time?

I think my little brother might have a peanut allergy. He doesn?t think so because he?s had them his whole life and never had problems. Could he have developed the allergy over time or would he just be born with it?
Food allergies are one of the most common medical problems. They commonly develop early in childhood, and they less commonly develop later in life. In fact, food allergies that occur in childhood will sometimes get better as the person gets older. That being said, it is technically possible for allergies to food to develop at any point, so if your brother has symptoms consistent with allergies to peanuts, he should set up a visit to discuss this with his primary care doctor. One of the particular concerning things about peanut allergies is that they tend to be one of the more serious forms of food allergy. Therefore, if there is in any question, it would be best to avoid peanuts until he can be tested by his doctor and this problem ruled in or out. He should also be on the lookout for any signs of a serious allergic reaction. These would include any swelling of the face, eyes, lips, or tongue, any nausea and vomiting after ingesting peanuts, or any wheezing or trouble breathing. If he experiences any of these symptoms, this is a serious medical emergency and he would need to seek immediate medical attention in an emergency room.
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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