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Doctor insights on: What Happens In An Allergic Reaction

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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
2,661 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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What happens after an allergic reaction to food? Does your stomach throw it up?

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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What happens if you have allergic reaction to TB skin test does it mean that you have tb?

What happens if you have allergic reaction to TB skin test does it mean that you have tb?

Was it allergic?: Was the reaction an allergic reaction or was it a positive sin test? There are components in the test that one can react to in an allergic fashion...The area can be red and itchy. But if it is raised and red and approx the size of a dime, it is a positive test and means you have been exposed to tb. ...Read more

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What happens if you get an allergic reaction to the contrast dye for CT scan?

What happens if you get an allergic reaction to the contrast dye for CT scan?

See below: With iodinated based contrast you may get allergic reaction ranging from mild skin rash to severe rash, difficult breathing, severe drop in blood pressure and even cardiac arrest. Patients at risk are those with previous reaction, history of asthma or allergy. Please consult with your doctor. ...Read more

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How quickly does an allergic reaction happen?

How quickly does an allergic reaction happen?

Depends: It all depends on the problem. Allergic reactions can be immediate or take hours or even days to occur. ...Read more

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Can my allergic reaction happen more than once in a day?

Can my allergic reaction happen more than once in a day?

It's possible: Allergic reactions can take several patterns. There can be acute/early symptoms only; there can be a dual response with symptoms happening, then recurring several hours later or there can be delayed onset symptoms. Also, if there is recurrent exposure to the allergic trigger, then symptoms can recur with each exposure. Keep track of the timing of symptoms and call an allergist to assist. ...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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What can happen if i don't do anything about an allergic reaction?

What can happen if i don't do anything about an allergic reaction?

Depends: If the reactions are from an acute exposure, one may expect subsidence in symptoms after a few hours. If the reaction is from daily exposure, then your quality of life will likely be adversely affected. If you have allergic asthma, you may end up in the hospital or worse if it goes untreated. If you have an anaphylactic reaction, you may die from it. The outcome depends on the severity . ...Read more

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What is the worst thing that could happen due to an allergic reaction?

What is the worst thing that could happen due to an allergic reaction?

Anaphylaxis: The most severe reaction that can occur after repeated exposure to something you are allergic to is called anaphylaxis. This rare but sudden condition causes itchy welts (hives), followed by wheezing, shortness of breath, and occasionally, swelling of the tongue or throat. Without treatment, swelling of the tongue or throat can sometimes worsen and block the airway. ...Read more

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Does allergic reaction to medicine like not being able to breath happen right away?

Does allergic reaction to medicine like not being able to breath happen right away?

Within 30 min-1 hour: Usually allergic reactions after ingestion of food or medication occur within 30 min to an hour. ...Read more

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What is an allergic reaction?

What is an allergic reaction?

An altered reaction: The roots of "allergy" are from greek "allos" (different) and "ergos" (action). So, an allergic reaction is a "different" (from normal) reaction. The reaction occurs to an allergen. An allergen can be a pollen (ragweed), food (peanut), animal (dust mite or bee venom), or other foreign substances. Symptoms occur due to histamine and other chemicals and cause sneezing, runny nose, etc. ...Read more

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What to do if allergic reaction!?

What to do if allergic reaction!?

Allergic Reaction?: Not sure what you mean by allergic reaction. If you are referring to anaphylaxis then epinephrine is the treatment of choice, call 911. Allergic rhinitis is treated with OTC antihistamines, daily intranasal steroid or antihistamine sprays, saline rinses, etc. Allergy shots also an option. Avoidance of triggers is important but see an Allergist first to determine exactly what you are allergic to. ...Read more

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What is causing my allergic reaction?

Why allergists exist: Finding & treating the cause of allergic reactions is the main function of an allergist. A solid understanding of the immune system is required, so that immunology goes hand in hand. Timing, prevalence of various causes, location, description, examination, associated factors, family history and finally testing enables allergists to identify the culprit, if one is present; treatment is pt-centered. ...Read more

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How can I treat an allergic reaction?

How can I treat an allergic reaction?

Benadryl (diphenhydramine): Immediately stop eating the food you think is causing the problem. Take liquid or dissolving Diphenhydramine (benadryl). If your reaction is worse: cough, shortness of breath, wheezing, chest tightness, difficulty breathing, hives all over your body, swelling of lips and tongue, etc., then you need to use your Epinephrine autoinjector (epipen, twinject) and go to the nearest emergency room. ...Read more

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What to do about an allergic reaction?

What to do about an allergic reaction?

Call your doctor: For mild symptoms i would call your doctor. If there symptoms are severe such as trouble breathing, throat closing, feeling faint you should call 911 and go to the emergency room. ...Read more

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Could i get the same allergic reaction?

Could i get the same allergic reaction?

Yes.: The nature of allergy is that repeat exposure results in repeat, and often more exaggerated, response. There is always the question of whether the initial reaction was true allergy or something else like irritant response or drug side effect. Another important aspect of allergy is "cross-reactivity", which occurs when similarly structured molecules (eg drugs in the same family) are recognized. ...Read more

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What can an allergic reaction feel like?

What can an allergic reaction feel like?

Depends where: In the skin itchy. In the nose itchy, sneezy, runny & stuffy. In the eye itchy and teary. In the lungs coughing, wheezing, weight on chest. In the digestive tract nausea, vomiting, cramps, diarrhea. ...Read more

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What's an allergic reaction? Is mcs real?

What's an allergic reaction? Is mcs real?

Inflammatory rxn: An allergic reaction is the body's defense against an agent it considers harmful or toxic to the body. Most allergic reactions start with food allergies that are undiagnosed and "rev up" the immune system leading to multiple other reactions to environmental items as in mcs. First firgure out what's wrong with the gut and fix it and the immune system will settle down and others will lessen/go away. ...Read more

Dr. John Chiu
1,052 doctors shared insights

Allergic Reaction (Definition)

A sensitivity to substances called allergens that come into contact with the skin, nose, eyes, respiratory tract, or gastrointestinal tract. They can be breathed into the ...Read more