Allergies occur when the immune system overreacts to certain substances that are normally harmless. Symptoms range from itchy eyes and sneezing fits to skin changes or breathing difficulties. How quickly a reaction sets in and how severe it becomes depends on the type of allergy. Recurring symptoms should therefore be evaluated based on their pattern and possible triggers. [1]
When people hear the term “allergy,” they often think first of a positive test result. In everyday life, however, another question is crucial: Which substance actually causes symptoms in you, and under what circumstances? This article takes you from observation through diagnosis to a treatment whose benefits and limitations you can understand.
How Allergies Develop
IgE antibodies play a role in many common allergies. After sensitization, renewed exposure to the corresponding allergen can trigger the release of mediators such as histamine. This can cause symptoms such as itching, swelling of the mucous membranes, or a runny nose. A genetic predisposition can increase the risk; whether a condition develops also depends on environmental conditions and other factors. [1]
Other allergies work differently. In contact allergies, certain memory cells of the immune system react to a substance, such as nickel or a fragrance. Eczema typically develops gradually. This so-called delayed-type reaction cannot be easily explained by the same test used for an immediate reaction to pollen. That is why not every allergic condition requires an IgE blood test. [2]
Which symptoms may be related
Possible triggers include pollen, dust mites, components of animal secretions, foods, and certain medications. Symptoms can primarily affect the eyes and nose, the skin, or the respiratory tract. However, sneezing, coughing, or a rash do not in and of themselves prove the presence of an allergy: similar symptoms can also occur with other conditions. [1]
Food allergies, for example, can cause itchy skin, swelling, abdominal discomfort, or breathing difficulties. Some reactions occur quickly, while others are delayed. The timing of the reaction relative to a meal is a clue for the doctor’s consultation, but it does not yet constitute a definitive diagnosis. Especially after a severe reaction, you should not try the suspected trigger again on your own. [5]
Three columns may be enough for your notes: Situation, Symptoms, and Progress. For example, note whether your eyes water when you’re in the garden, when a rash began, or what food you ate before a reaction occurred. Include photos of visible changes and any medications you’ve already taken. Such specific observations are more helpful than assuming you’re allergic to just about everything.
Allergy or Intolerance: Why the Distinction Matters
An intolerance is not automatically an allergy. In the case of lactose intolerance, for example, lactose is not properly digested due to an enzyme deficiency; the reaction is not directed against milk protein, as it is in a milk allergy. Both conditions may manifest after consuming similar foods, but they require different diagnostic approaches and counseling. A general statement such as “I can’t tolerate milk” is therefore not sufficient for a specific recommendation. [4]
Don’t permanently cut out entire food groups just because of the results of a store-bought self-test. An evaluation conducted under the guidance of a doctor or dietitian helps ensure your diet remains as varied as possible. If certain foods need to be temporarily eliminated, there must be a clear purpose, an appropriate timeframe, and an agreed-upon assessment. In the case of a potentially severe allergy, the subsequent reintroduction of those foods should also be handled by a professional. [4], [7]
A positive allergy test does not constitute a complete diagnosis
A detectable specific IgE level initially indicates sensitization to the substance being tested. It does not automatically prove that this particular substance is causing your symptoms. People can be sensitized without becoming ill upon normal exposure. The significance of a test result can therefore only be determined in conjunction with the patient’s medical history and, if necessary, further tests. Even a single test result cannot replace this assessment. [3]
In practical terms, this means: If you can eat a particular food without any problems and a comprehensive lab panel reports an abnormal result for it, the discrepancy should be clarified by a specialist. A long list of red flags should not automatically become a long list of prohibited foods without further investigation. Conversely, a convincing history of reactions deserves attention, even if an initial test does not provide a clear answer. [7]
During the discussion of your test results, ask for a clear breakdown: Which diagnosis is considered confirmed? What is merely a suspicion? Which findings currently have no apparent significance? Also, ask for an explanation of what the consequences of further testing would be. This way, a collection of lab results can be turned into a clear plan for your daily life.
What Tests Might Be Useful
In a prick test, selected allergen solutions are applied to the skin, and the top layer of skin is lightly pricked. A local reaction is assessed after a short waiting period. Which allergens are tested and how to interpret the results depend on the symptoms. Medications can affect the test results; therefore, do not change any ongoing treatment unless instructed to do so by the testing facility. [15]
If a contact allergy is suspected, a patch test may be considered: Appropriate substances are applied to the skin in a standardized test arrangement, and the delayed reaction is evaluated by a doctor. This type of test addresses a different issue than the prick test. If a contact allergy is confirmed, identifying the specific trigger helps in selecting appropriate skincare products or work materials. [2]
For an unclear food allergy, a supervised oral challenge may be necessary. During this procedure, conducted under appropriate medical conditions, it is determined whether a suspected food actually triggers symptoms. Because serious reactions are possible, this is not something you should attempt on your own at home. The choice of blood tests, skin tests, and challenge tests is based on the patient’s specific medical history and individual risk. [14]
Why IgG Panels and Bioresonance Are Not a Shortcut
Food-specific IgG tests are sometimes offered as a comprehensive means of detecting food-related problems. However, there is no reliable diagnostic basis for this. IgG antibodies may simply reflect exposure to a food; certain IgG responses are also associated with tolerance. An abnormal IgG panel is therefore not sufficient grounds for avoiding numerous foods. The AAAAI, the professional allergy and immunology society, advises against this use. [6]
Electrodermal methods such as Vega tests and related bioresonance approaches also lack evidence to support a reliable allergy diagnosis. The professional association ASCIA recommends that such results not be used to make a diagnosis or guide treatment. A device report should therefore not replace a medical evaluation and should not serve as the basis for making independent changes to medication. [12]
Treatment: Relieve Symptoms and Address Specific Triggers
Antihistamines can relieve certain allergic symptoms. There are active ingredients that cause varying degrees of drowsiness, as well as different dosage forms. Even with medications described as having minimal sedative effects, drowsiness is possible. Seek medical advice, especially if you are taking other medications, need to drive, are pregnant, or want to treat a child. The choice and use of the medication depend on the specific product and your situation. [8]
For allergic rhinitis, anti-inflammatory nasal sprays containing corticosteroids may be helpful. Whether they are used alone or in combination with other medications depends on the symptoms. It is also crucial for effective treatment to use the medication correctly and according to the prescribed schedule. [9]
In the case of contact allergy, the focus is on avoiding the confirmed irritant; inflamed eczema may require additional treatment. Allergen avoidance involves making specific adjustments based on the diagnosis. The goal of creating a completely allergen-free environment is neither a practical nor a verifiable treatment goal for most everyday situations. [2]
When Allergen immunotherapy Is an Option
For certain respiratory allergies, allergen immunotherapy can have a long-term effect on the body’s reaction to the relevant trigger. Approved allergen preparations are administered under the skin or under the tongue, depending on the method. Suitability depends on the diagnosis, the allergen, the product, and the patient’s health status. Treatment usually lasts several years; it is not a one-size-fits-all solution for every allergy. [10]
During your consultation, ask about the specific treatment goal, the time commitment, and the planned approach to managing side effects. It’s also a good idea to agree on when your progress will be reviewed. A realistic plan describes how improvement would be recognized and what will happen if there is no benefit. This makes it easier to make a decision that fits your symptoms and your daily life.
Warning Signs of a Severe Allergic Reaction
Rapidly increasing swelling of the tongue or throat, severe shortness of breath, circulatory problems, or altered consciousness may be signs of anaphylaxis. This reaction is a medical emergency. Immediately use a prescribed emergency epinephrine injection as directed and call for help right away. Medical care is still necessary even if your symptoms improve initially. Antihistamines are not a substitute for emergency treatment in this situation. If you suspect anaphylaxis, do not stand up or walk around, even if you feel temporarily better. [11]
In Austria, you can reach emergency services by dialing 144, and the European emergency number by dialing 112. [13]
If you already have a known severe allergy, you should regularly review your personal emergency plan with your healthcare team. This also includes making sure that the people closest to you know where your prescribed emergency medications are kept and how to get help. A written plan can help you remember the crucial steps to take in a stressful situation. [5]
Targeted Testing for Insect Venom and Medications
A slight, temporary redness after a bee or wasp sting is not necessarily evidence of an insect venom allergy. Reactions that extend beyond the sting site, however, must be carefully evaluated. Following a severe allergic reaction, the specialist will discuss emergency precautions with you and whether you are a candidate for specific immunotherapy. The exact details of the previous sting incident are particularly important for this decision. [16]
Even an adverse drug reaction is not always allergic in nature. To determine the cause, the exact name of the medication, the timeline of events, and the observed symptoms are important. Therefore, please also bring information about over-the-counter medications and dietary supplements. A confirmed drug allergy should be documented in writing and reported during future treatments. A doctor will determine which alternatives are appropriate; attempting to take the medication again is not considered self-treatment. [17]
Prepare Well for Your Next Appointment
Bring any existing medical reports, a current list of medications, and your most important observations. Describe as specifically as possible what you’d like to be able to do better in your daily life: sleeping through the night, working outdoors, exercising, or choosing foods without unnecessary anxiety. Discuss which of these goals should be addressed first and when a follow-up visit would be appropriate.
To help guide you moving forward, you can make a note of three key points from the conversation: the confirmed trigger or the remaining suspicion, the agreed-upon approach to managing symptoms, and the reason for following up. If anything remains unclear, ask for a simpler explanation. A clear diagnosis is essential for you to be able to put recommendations into practice in your daily life.
Sources and Further Information
- Austrian Health Portal: What Is an Allergy?. Retrieved October 28, 2026.
- Austrian Health Portal: Contact Allergy. Retrieved October 28, 2026.
- Austrian Health Portal: IgE Antibodies. Retrieved October 28, 2026.
- NHS: Food Intolerance. Retrieved October 28, 2026.
- NHS: Food Allergy. Retrieved October 28, 2026.
- AAAAI: The Myth of IgG Food Panel Testing. Retrieved October 28, 2026.
- EAACI Guideline 2023: Diagnosis of IgE-Mediated Food Allergies. Retrieved October 28, 2026.
- NHS: Antihistamines. Retrieved October 28, 2026.
- Austrian Health Portal: Pollen Allergy. Retrieved October 28, 2026.
- EAACI Guideline 2018: Allergen Immunotherapy for Allergic Rhinoconjunctivitis. Retrieved October 28, 2026.
- NHS: Anaphylaxis. Retrieved October 28, 2026.
- ASCIA: Evidence-Based Versus Non-Evidence-Based Allergy Tests and Treatments. Retrieved October 28, 2026.
- Austrian Health Portal: Emergency Numbers. Retrieved October 28, 2026.
- AAAAI: Food Allergy. Retrieved October 28, 2026.
- AAAAI: Allergy Testing. Retrieved October 28, 2026.
- Austrian Health Portal: Insect Venom Allergy. Retrieved October 28, 2026.
- Austrian Health Portal: Drug Allergy. Retrieved October 28, 2026.
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