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Doctor insights on: Onion Allergy Intolerance

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I have IBS and a dairy intolerance, I have noticed lately that i cannot eat bacon or onion or i feel sick, can this be an allergy?

I have IBS and a dairy intolerance, I have noticed lately that i cannot eat bacon or onion or i feel sick, can this be an allergy?

Diet: In general, foods high in fat, fried foods, spicy foods, alcohol, and caffeinated coffee and tea can be problematic. Some foods, such as beans, cabbage, broccoli, brussels sprouts, cauliflower, peas, onions, and bagels, that can cause minor discomfort .You have also lactase deficiency which is often associated with ibs and limits dairy intake. More likely related to ibs than allergy.Consult md. ...Read more

Dr. John Chiu
2,574 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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How common are allergies to onions?

How common are allergies to onions?

Onion Allergy: Not very although it is possible; just depends on what your allergic reaction is. Because onions grow in the ground, it might be that you are allergic to grass or weeds but have a cross-reactive reaction taking place called oral-allergy syndrome. ...Read more

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What is an allergy compared to intolerance?

What is an allergy compared to intolerance?

Immune system: Allergy is caused by an immune response (usually IgE) to a foreign agent- usually a protein. Intolerance is not mediated by an immune system but something unique to that person. Some may be psychological in nature ...Read more

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What is the difference between allergy and intolerance?

What is the difference between allergy and intolerance?

The immune response: An allergy is caused by specific cells and/or proteins in the body that are designed to recognize specific sites in the allergen, i.e. Peanut, walnut, cat dander, etc. These include immunoglobulin e, and t and b cells. An intolerance is caused by an inability to digest a sugar or protein, but does not involve the same immunoglobulins and cells. ...Read more

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What's the difference between an intolerance and allergy?

What's the difference between an intolerance and allergy?

Broad v specific: An allergy reaction is a very specific sort of immune response involving a specific set of cells and inflammatory mediators. An intolerance has a much broader definition and is typically not an immune system reaction. Lactose intolerance, for instance, is an enzyme deficiency that makes one unable to digest lactose. ...Read more

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How common is an allergy or intolerance to nightshade vegetables/foods? What are the typical symptoms?

How common is an allergy or intolerance to nightshade vegetables/foods? What are the typical symptoms?

Fairly: Allergy is likely rare but intolerance likely fairly common. Allergy to foods in the nightshades family in not that different from other allergy allergies although anaphylaxis must be very rare. As for intolerance, it can be almost anything with different people having different symptoms to a certain food. ...Read more

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What can I do about possible food intolerance or allergy?

What can I do about possible food intolerance or allergy?

Food allergy: 1. Accurate diagnosis, which may involve blood or skin tests. I usually use both. 2. A trial of specific food elimination with a food diary to track symptoms. 3. Food reintroduction, possibly in the setting of an in-office challenge depending on your history. This procedure should help you delineate which foods truly cause problems for you. Avoidance is the only available treatment right now. ...Read more

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Could food intolerances get worse or turn into allergies?

Could food intolerances get worse or turn into allergies?

Yes and no: Food intolerance like lactose intolerance can certainly get worse. However, they do not become food allergies. That is not to say you cannot develop food allergies if you have a food intolerance, but the two are not related. ...Read more

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How to get tested for allergies/intolerances at the doctors?

Skin or blood test: Allergists can perform blood or skin prick testing in the office to determine environmental and food sensitivities which could indicate allergy. ...Read more

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What's the difference between a food allergy and intolerance?

What's the difference between a food allergy and intolerance?

Intolerance subset: Food allergy (fa) is a subset of food intolerance (fi). Fa involves an abnormal immune system reaction to an otherwise innocuous food. Mechanisms of fi include inability to digest a food as in lactose intolerance. Fa can be life-threatening; fi is not. Symptoms of fi are limited to the GI tract - pain, bloat, gas, vomiting, diarrhea. Fa symptoms may be GI as well as respiratory, skin & cardiac. ...Read more

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Might it happen that a food intolerance develop into an allergy?

Might it happen that a food intolerance develop into an allergy?

Unlikely: Food intolerance is a common problem, but it is not a risk factor to go on to develop an allergy to that particular food. For example, lactose intolerance from cows milk does not increase risk of developing cow's milk protein allergy. ...Read more

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Might I have a wheat intolerance/allergy? How would i be able to tell?

Might I have a wheat intolerance/allergy? How would i be able to tell?

Gluten sensitivities: Wheat or gluten sensitivities include a wide spectrum of presentations from well-defined celiac disease to other vaguely defined conditions like ibs-like symptoms, and problems outside of the gut like gluten ataxia or peripheral neuropathy. Since it is complicated, a good history taken by your physician with supporting tests might me helpful to tell if you have sensitivities or allergy to wheat. ...Read more

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What is the difference in symptoms of dairy allergy vs. Dairy intolerance?

What is the difference in symptoms of dairy allergy vs. Dairy intolerance?

Allergy not just GI: Dairy intolerance is caused by an inability to digest milk sugar lactose into two simpler sugars. This results in gas, cramps, bloating, flatulence & diarrhea. Dairy allergy may cause these same symptoms but typically also causes vomiting, skin rashes like hives or eczema & even triggers allergic rhinitis & asthma. If symptoms all GI try lactose-free milk. You'll have no symptoms if intolerant. ...Read more

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Can there be any test to diagnose a suspected food allergy or intolerance?

Can there be any test to diagnose a suspected food allergy or intolerance?

Yes and not really: Food allergy is diagnosed by assessing the history (in the context of symptoms), and either allergy skin test or specific ige blood test. These are especially helpful in confirming a patient does not have food allergy if test is negative. Sometimes a food challenge is performed to really assess if the food allergy is present. Lactose intolerance can be diagnosed with a breath hydrogen test. ...Read more

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I want to know what is the difference between food allergy and intolerance?

IgE vs non-IgE: True food allergy is mediated by the ige antibody and can be tested for by skin testing or blood ige. Symptoms can be severe and only a small amount needed to cause a reaction. Intolerance are almost always GI symptoms (pain, diarrhea, etc) and have negative ige blood and skin tests. Small amounts of food may be tolerated but a "threshold dose" above which symptoms will occur. ...Read more

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I want to know what is the difference between a food allergy and an intolerance?

I want to know what is the difference between a food allergy and an intolerance?

Immunology: An allergic reaction is caused by your immune system reaction to the food. Skin tests and blood test can be helpful with the diagnosis. An intolerance is an adverse reaction not through an immunologic mechanism. An example is lactose intolerance where you loose the ability to break down sugars in milk. Allergy testing will not be helpful for an intolerance. ...Read more

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Advice on having food allergies or intolerances?

Advice on having food allergies or intolerances?

Food allergies: Food intolerance is more common than food allergies. 90% of all true food allergies are caused by 8 different foods. Allergists are your best resource for food allergy information. For more food allergy facts, go to my blog at: http://www.Familyallergyasthmacare.Com/2013/11/did-you-know-facts-about-food-allergies-in-the-u-s/. ...Read more

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Tomato allergy or intolerance possible?

Tomato allergy or intolerance possible?

Yes: Both are possible. You can get an ige blood test to see if you are allergic. It is available from immunocap at quest labs. Intolerance is often related to the acid content of tomatoes. ...Read more