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Doctor insights on: When A Person Has An Allergic Reaction To Food What Happens Inside The Body

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What happens with an allergic reaction to food?

What happens with an allergic reaction to food?

Often delayed rxn: Foods must generally first be digested, then absorbed into the body so reactions to them are usually delayed and are igg reactions. One often thinks of the peanut allergy that is immediate and deadly which is and ige reaction. The reactions can vary from diarrhea to constipation, skin rashes, joint pains, hair loss and more so testing with a specialty igg blood test is required to "figure it out". ...Read more

Dr. John Chiu
2,491 doctors shared insights

Allergies (Definition)

Allergies occur when your immune system is triggered by envirionmental factors it should ignore--for example, pollen in the air, or dander on a cat or dog--and creates cells to fight against them. An allergic reaction typically causes itching, congestion, or drainage, and ...Read more


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On average, how long will an allergic reaction to food last?

On average, how long will an allergic reaction to food last?

Allergic reactions: Food allergic reactions typically begin within 30 munutes of an ingestion and typically peak at about 30 minutes after they begin. The reaction may be short lived, lasting only a few hours (typical) or long-last; possibly for days (rare). ...Read more

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Can you please tell me about effective home remedies for an allergic reaction to food?

Can you please tell me about effective home remedies for an allergic reaction to food?

Avoid the food: If you truly have food allergies, the only treatment is to avoid the food. More times than not, responses to foods are not allergies, but rather intolerances. See a board certified allergist if you have had a severe food reaction with typical allergic symptoms of hives, throat or chest tightness, or other allergy symptoms. ...Read more

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What are signs and symptoms of an allergic reaction to food?

What are signs and symptoms of an allergic reaction to food?

Varies: Immediate reactions to a food can include hives, feelings of throat tightening and itching, shortness of breath, flushing of the skin and overwhelm feeling of doom. This can develop into nausea and vomiting as well as diarrhea. Some foods can cause a delayed skin reaction such as eczema and not always the immediate reaction. As always consult with your doctor get tested and avoid possible foods. ...Read more

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What happens after an allergic reaction to food? Does your stomach throw it up?

Varies: Immediate reactions to a food can include hives, feelings of throat tightening and itching, shortness of breath, flushing of the skin and overwhelm feeling of doom. This can develop into nausea and vomiting as well as diarrhea. Some foods can cause a delayed skin reaction such as eczema and not always the immediate reaction. As always consult with your doctor get tested and avoid possible foods. ...Read more

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How common is it to develop an allergic reaction to food? If you never had allergies before.

How common is it to develop an allergic reaction to food? If you never had allergies before.

Not rare: An allergic respose takes place when your immune system recognizes a foreign substance. Highly allergic people's immune system does this quickly. Another person may need to be exposed to the substance (food) hundreds of times before it reacts to it. Once it recognizes it as foreign it will repond instantanously every time it sees it. A never allergic respose turns into an always response. ...Read more

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How do I know if I need immediate help for an allergic reaction to food? I seem to be breathing okay now, but had some trouble earlier.

How do I know if I need immediate help for an allergic reaction to food? I seem to be breathing okay now, but had some trouble earlier.

Breathing: If you notice ANY symptoms associated with difficulty breathing - to include itchiness in the throat or tongue/lip swelling - you need to get to an emergency department quickly. Hope this helps! Get well. ...Read more

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Can you prevent an allergic reaction to food by taking antihistamines before eating?

No: The only effective treatment for a food allergy is avoidance of the food. Antihistamines should not be relied upon to prevent food allergy symptoms which can be severe and even life-threatening. ...Read more

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I had an allergic reaction to food and there is a rash on my face how do I get rid of it?

I had an allergic reaction to food and there is a rash on my face how do I get rid of it?

Urticaria: The fancy name for what you have is called "urticaria". If you didn't do anything the rash will clear on it's own. However, to speed up the process take 1 Claritin (loratadine) every morning. In addition, rub in 1%hydrocortisone cream 2 times each day for 20 seconds. Avoid caffeine and alcohol as these tend to increase the appearance of the redness. ...Read more

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Dr. John Chiu
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Allergic Reaction (Definition)

Allergic reactions are sensitivities to substances, called allergens, that come into contact with the skin, nose, eyes, respiratory tract, and gastrointestinal tract. They can be inhaled into the ...Read more


Dr. Heidi Fowler
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