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Doctor insights on: What Is The Average Time A Person Can Have An Allergic Reaction

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What is the average time a person can have an allergic reaction?

What is the average time a person can have an allergic reaction?

Variable: This is highly variable depending on the allergic reaction. Major reactions can occur immediately up to 8 hours after the fact. Minor reactions can have a delayed hypersensitivity occurring 24-72 hours later. ...Read more

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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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If I have an allergic reaction only to undercooked shrimp, wouldn't i just be allergic to shrimp all the time?

If I have an allergic reaction only to undercooked shrimp, wouldn't i just be allergic to shrimp all the time?

Shrimp allergy: Many foods have multiple allergens some of which may be destroyed by cooking. Most of time people react to cooked shrimp but it is possible to only be allergic to the protein which are destroyed by cooking. However over time you could develop allergy to cooked shrimp as well. ...Read more

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Is it possible to have an allergic reaction to amoxicillin after using it several times previously? I'm on day 4 of 875mg/2x daily and today I am breaking out in hives. What should I do?

Is it possible to have an allergic reaction to amoxicillin after using it several times previously? I'm on day 4 of  875mg/2x daily and today I am breaking out in hives. What should I do?

Medicine allergies: Yes. The thing to understand about allergic reactions is that the body generally has to have had prior exposure before an allergic response. It is actually rare to have a true allergy to something with the first exposure.You should stop the medicine and notify your physician to get a different antibiotic and document the allergy. ...Read more

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How long does an average allergic reaction last for?

How long does an average allergic reaction last for?

No average allergy: Everyone's allergic reaction varies. There can be mild symptoms or severe symptoms. You can have continual exposure to the allergen (pollen for example) or acute exposure (like eating shellfish). The cause of the allergy, the severity of symptoms, and other factors all play into how long an allergic reaction occurs. ...Read more

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What is the typical length of time for an allergic reaction?

What is the typical length of time for an allergic reaction?

Depends.: An acute allergic reaction to a food, drug or insect sting begins in a few minutes & lasts 2 to 48 hours. Pollen, animal dander, dust mite & mold allergies begin in minutes but last as long as exposure continues. For example, ragweed allergy lasts for about a month. Acute contact dermatitis (poison oak/ivy) lasts 1-2 weeks; chronic (nickel) resolves only with removal of the offending agent. ...Read more

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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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How much time would it take for an allergic reaction to happen?

How much time would it take for an allergic reaction to happen?

Timing/allergic rxn: An allergic reaction due to an ingestion ( food, medications ) can occur within minutes up to approximately 6 hrs. Reactions to skin contacts ( poison Ivy, chemicals, etc) can occur 24-96 hours after exposure. ...Read more

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For what length of time can an allergic reaction in a child last?

For what length of time can an allergic reaction in a child last?

Allergic reaction: You do not specify the type of the allergic reaction. Acute ones are severe but do not last long, delayed reactions can last for a few days, you need to provide more specific symptoms for an accurate answer. ...Read more

Dr. John Chiu
1,005 doctors shared insights

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