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Onion allergy is more than just shedding a few tears in the kitchen. For all of us affected, it’s a serious health concern that demands attention and understanding. Let’s dive into the world of onion allergy, exploring its features, symptoms, and how to navigate daily life while having an onion allergy.

Introduction

Living with an onion allergy can be challenging, but it’s crucial to identify and get familiar with this food allergy. Understanding and effectively managing onion allergy is important for a healthy and safe lifestyle. This is the reason why I decided to create an informal guide about onion allergy. Since there is a lot of information, I decided to split it into 7 parts. In the first part of the guide, I will unravel the mysteries of onion allergy, exploring the science behind it, what are the symptoms of onion allergy, and how to get a diagnosis of onion allergy.

Exploring onion allergy

Understanding the culprit: Alliinase and onion allergy

The journey begins with a closer look at the science behind onion allergy.  Alliinase, an enzyme present in onions, plays a pivotal role in triggering allergic reactions. This enzyme induces allergenic properties, leading to various types of onion allergy.

Onions, innocent-looking vegetables are home to an enzyme – Alliinase. This enzyme holds the key to the allergic reactions to onion.

Enzyme Alliinase plays a crucial role in onions and other Allium plants.
When plant tissue is damaged (cut, crushed, etc.), alliinase catalyzes the conversion of a compound alliin into allicin.
Allicin is responsible for the strong aroma and flavor of onions and it is responsible for triggering allergic reactions.

How does our body react when it’s exposed to onions?

When you come into contact with allicin, a compound produced by the enzyme alliinase, either through inhalation or ingestion, it can trigger a chain reaction in the immune system. Your body perceives allicin and other allergy-causing compounds in onions as threats and launches an immune response. This response involves the release of chemicals like histamine by immune cells, leading to the manifestation of various allergic symptoms. For more information about how our body reacts to food allergens, check out my article about Food allergies.

Variants of onion allergy

Did you know that there are 3 different variants of onion allergy? Variants of onion allergy are skin contact allergy, airborne allergy, and food allergy. All variants of onion allergy are serious medical conditions. Each person reacts differently, and they can experience one, two, or all three variants of onion allergy.

Skin contact allergies: This is the most common type, causing reactions like redness, itching, and blisters after touching onions.
Airborne allergies: Inhaling onion fumes can trigger symptoms like sneezing, runny nose, and in some cases anaphylaxis (mainly from raw or lightly cooked onion fumes).
Food allergies: Consuming even small amounts of onion can lead to reactions like nausea, vomiting, hives, and even anaphylaxis in severe cases.

Onion allergy, much like allergies in general, can present themselves in diverse ways. It’s crucial to recognize that there isn’t a single, uniform manifestation of an onion allergy.

Symptoms of onion allergy

Symptoms of onion allergy can vary greatly between individuals and can be immediate (occurring within minutes) or delayed (arising hours later).

Immediate allergic reactions

When you come into contact with onions or onion-derived ingredients, your body can react almost immediately. These reactions can vary from mild to severe and may include:

Itching: Anywhere on the body, particularly around the mouth, lips, or throat.
Hives: Raised, red welts or bumps on the skin.
Swelling: Lips, tongue, face, or throat, potentially affecting breathing or swallowing.
Nasal Congestion: Runny or stuffy nose, sneezing, or itching in the nasal passages.
Anaphylaxis: Life-threatening reaction requiring immediate medical attention.

Delayed allergic reactions

Not all symptoms of onion allergy appear immediately. Some reactions may have a delayed onset, occurring hours after onion exposure. These delayed symptoms can include:

Digestive Issues: Nausea, vomiting, abdominal pain, heartburn, or diarrhea.
Skin Reactions: Rashes like eczema or contact dermatitis.
Respiratory Symptoms: Wheezing, coughing, or shortness of breath.
Headache: Migraine, tension, etc.
Loss of consciousness: Seek immediate medical attention.
Dizziness: Seek medical attention if severe.
Anaphylaxis: Seek immediate medical attention.

Understanding your symptoms

Understanding the severity of onion allergy symptoms is crucial for managing your food allergy effectively. Symptoms can range from mild to severe, with severe reactions potentially leading to anaphylaxis, a life-threatening allergic reaction.

While some symptoms may be mild and manageable at home, but, seek immediate medical attention for severe reactions including swelling, difficulty breathing, anaphylaxis, loss of consciousness, or severe dizziness. Remember, the severity and type of symptoms can vary from person to person. Consulting a healthcare professional for personalized guidance and an allergy action plan is crucial for any individual with any food allergy.

Diagnosing onion allergy

To effectively manage onion allergy, proper diagnosis is key. I will provide an overview of diagnostic methods that are used for diagnosing any food allergy. Also, it is important to consult with allergists for accurate and personalized guidance.

Diagnosing onion allergy: unraveling the mystery

When it comes to managing onion allergy, accurate diagnosis is essential. Here is a closer look at what to expect when you go to allergy testing:

Medical history

The first step in diagnosing onion allergy involves discussing your medical history. Allergists will inquire about past allergic reactions, symptoms experienced after onion exposure, and any known allergies to other substances.

Allergy testing

Allergy tests play a crucial role in confirming onion allergy. These tests may include:

Skin Prick Test: A small amount of onion extract is applied to the skin, and the area is pricked to allow the allergen to enter. If a raised bump or redness develops, it indicates an allergic reaction.
Blood Tests: Blood tests, such as specific IgE tests, measure the levels of antibodies produced in response to onion allergens. Elevated antibody levels suggest an allergic reaction.
Oral Food Challenge: In some cases, allergists may conduct an oral food challenge under medical supervision to confirm onion allergy. This involves gradually increasing doses of onion-containing food and monitoring for allergic reactions. Do not do this on your own!

Elimination diet

An elimination diet involves removing onions and onion-derived ingredients from the diet for a period and then reintroducing them while monitoring for allergic reactions. This method can help identify specific food triggers and confirm onion allergy.

Consulting with allergists

It’s important that if you suspect that you have an onion allergy consult with allergists. Allergists are specialized healthcare professionals trained in diagnosing and managing allergic conditions. They can conduct comprehensive evaluations, interpret allergy test results accurately, and provide personalized guidance on managing your allergies.

Why is consulting with allergists important?

Accurate Diagnosis: Allergists, have the expertise to conduct thorough evaluations and accurately diagnose food allergies, ensuring appropriate management strategies.
Personalized Guidance: Allergists can provide tailored advice on avoiding food allergens, managing allergic reactions, and implementing allergy treatments like allergen immunotherapy if needed.
Continuous Monitoring: Regular follow-up appointments with allergists allow for ongoing monitoring of food allergies and adjustments to treatment plans as needed.

By consulting with your allergists for proper diagnosis and personalized guidance, you can take proactive steps toward effectively managing your food allergies and maintaining optimal health.

FAQs about onion allergy

What are the symptoms of onion allergy?

Symptoms of onion allergy can vary between individuals, and they are itchy skin, hives, swelling of lips, face, and throat, nausea, vomiting, abdominal pain, heartburn, diarrhea, wheezing, coughing, headache, loss of consciousness, dizziness, and anaphylaxis.

Can an onion allergy develop suddenly?

Yes, onion allergy can develop at any age due to various factors such as changes in the immune system or exposure levels.

Are cooked onions safe for individuals with onion allergy?

Cooking does not eliminate onion allergens, so even cooked onions can trigger allergic reactions in sensitive individuals.

Can onion allergy cause skin rashes?

Yes, skin contact with onions, or consuming onions can lead to allergic reactions, causing redness, itching, and rashes.

Is it possible to outgrow onion allergy?

While some allergies may be outgrown, onion allergy often persist into adulthood. Consult with an allergist for personalized guidance.

How can I manage onion allergy in social situations?

Informing others about your allergy, reading food labels diligently, and carrying an epinephrine auto-injector are essential steps to manage onion allergy in social settings.

Conclusion

Living with an onion allergy requires knowledge, caution, and a proactive approach. By understanding the science behind the allergy, recognizing symptoms, and seeking professional guidance, individuals can effectively manage this condition. Embrace the journey of living with an onion allergy with confidence, armed with the right information and tools.

 

Check out the second part of my Surviving Onion Allergy guide here.

Disclaimer: This overview of onion allergy is only for information purposes and it does not replace advice from your healthcare provider. All the information here is only to inform you, not to diagnose you. If you have any symptoms or you suspect that you have an onion allergy, consult your GP first.

Dora

I was diagnosed with allium allergy when I was 15. Allium allergy means that I need to avoid eating onion, garlic, leek, chives and shallot.I love cooking and creating new recipes. With my educational and medical degree I am very happy to help everyone living with allium allergy.Browse my food blog and enjoy my unique no onion no garlic recipes.

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