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Allergies and food intolerance

Professionally updated: January 12, 2026

Allergies occur when our immune system reacts to substances it perceives as a threat – even though they are actually harmless. These substances are called allergens. The most common allergens include pollen, mold, pets, and certain foods. When the body encounters an allergen, it releases histamines, which leads to symptoms such as itching, hives, sneezing, and in severe cases, anaphylactic shock.

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Jakob Fraes
Specialist in General Medicine, Ph.D.
Read more about Allergies and food intolerance. Everything you should know.

Understanding the immune system's response

Our immune system is designed to protect us from disease. But sometimes it can get confused and see harmless substances as threats. When this happens, the body produces antibodies to fight these "threats", leading to an allergic reaction.

Symptoms and signs

The most common symptoms of allergy include itchy eyes, runny nose, sneezing and rash. In more severe cases, you may experience breathing problems or anaphylactic shock, which is a life-threatening reaction that requires immediate medical attention.

Food intolerance versus allergy

While allergies are a reaction from the immune system, food intolerance is a reaction from the digestive system. The symptoms can often overlap, but the treatment and causes are different. Food intolerances can cause stomach problems, bloating, and headaches.

Treatment and prevention

Allergy treatments can vary depending on the severity. Antihistamines are the most common treatment for relieving symptoms. Avoiding known allergens is also crucial. For those with severe allergies, immunotherapy (allergy vaccination) may be a solution.

How is it diagnosed?

An allergy test can help identify what you are allergic to. This can be a prick test, blood test or a patch test. The doctor will recommend the best test based on your symptoms.

Life with allergy

Living with an allergy can be challenging, but with the right knowledge and support, most people can live a normal life. It is important to be aware of your allergens and take the necessary precautions, such as having an epinephrine pen available if you are at risk of anaphylactic shock.

See the doctor today

After reading this information, if you feel you may have an allergy or food intolerance, it is recommended to book an appointment with a doctor for a correct diagnosis and treatment.

Frequently Asked Questions

Can allergies develop later in life?

Yes, allergies can develop at any point in life, although they often begin in childhood. It is possible to develop an allergy to something you have previously been exposed to without problems.

Why do some people get allergies while others don't?

Allergies are often a result of both genetic and environmental factors. If your parents have allergies, you may be more likely to develop them, but environmental factors such as exposure to allergens at an early age can also play a role.

Is it possible to outgrow an allergy?

Yes, some children can 'outgrow' their allergies, especially food allergies such as milk, eggs and soy. However, allergies such as shellfish allergy often continue into adulthood.

How can I get tested for allergies?

If you suspect you have an allergy, you should consult a doctor. They may recommend allergy tests such as a prick test, blood test, or patch test to identify specific allergens.