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Allergies - What Are They and How Can I Recognize Them?

Common condition: allergies - Allergies are among the most frequent chronic conditions in Germany. At least one in five adults suffers from at least one allergy; among children and adolescents, it's one in four. Allergies can be inherited or develop over the course of life. But what exactly are allergies, and how can I recognize them?

What Are Allergies?

Simply put, allergies are a hypersensitivity or dysfunction of the immune system. The immune system is actually our body’s defense team and fights off bacteria and viruses. In the case of an allergy, however, the immune system mistakenly reacts to harmless stimuli or allergy-triggering substances and tries to fight them using specific antibodies. These allergy triggers are called allergens and can include plant pollen, pets, dust mites, or certain foods. Symptoms can range from mild to severe and typically affect the respiratory tract, mucous membranes, eyes, nose, and skin. Sometimes they appear immediately, and other times only after hours or even days.

Symptoms

Typical symptoms of an allergy include:

  • Runny nose and sneezing
  • Coughing
  • Watery, itchy, and red eyes
  • Skin rash
  • Itching
  • Swollen mucous membranes
  • Shortness of breath

Allergy symptoms can resemble other illnesses, such as a cold or simple rhinitis. Therefore, if an allergy is suspected, a proper examination and diagnosis is essential — not only to confirm whether an allergy exists but also to identify the specific allergen.

How Can I Recognize an Allergy?

A common sign of allergies is that the parts of the body that came into direct contact with the allergen show symptoms. For example: sneezing and runny nose after inhaling dust, itching and swelling after petting an animal, skin irritation after using cosmetics, or throat swelling after eating certain foods. Existing neurodermatitis (a chronic, non-contagious skin condition) can increase the likelihood of developing allergies. If you're unsure whether you have an allergy but show typical symptoms, you should get tested by your doctor or visit our practice for an allergy screening. Untreated allergies can lead to more severe symptoms and spread throughout the body. An outbreak may affect the respiratory system or trigger an anaphylactic reaction. An untreated allergy can also develop into chronic asthma.

What Types of Allergies Are There?

Common types of allergies include:

  • Pollen allergy
  • Dust mite allergy
  • Mold allergy
  • Animal hair allergy
  • Food allergy
  • Insect venom allergy
  • Contact allergy (e.g. from cosmetics, jewelry, or clothing)

How Are Allergies Diagnosed?

Your doctor can run various tests to determine whether and to what you are allergic. Generally, allergy-triggering substances are applied to the skin, and the redness or size of the swelling is measured to determine the allergens and the intensity of the reaction.

  • Prick Test:
    Possible allergens are applied to the forearm and the skin is lightly scratched. This allows the allergens to enter the skin. If swelling and redness occur, an allergic reaction of the “immediate type” (Type I allergy) is present.
  • Patch Test (also known as epicutaneous test):
    The substances are placed in small chambers on a patch and applied to the skin for 3 days. After removal, the skin is checked. Small blisters or redness indicate an allergy.
  • Intradermal Test:
    A small amount of allergen solution is injected into the skin using a syringe. After 15 minutes, the reaction is assessed. Redness and wheals indicate an allergic reaction.
  • Provocation Test:
    This test is used to confirm or rule out an allergy with certainty and is usually performed after previous tests. Allergens are applied directly to the nose, bronchi, or eyes using sprays, inhalation, or eye drops.
  • Blood Tests:
    The test checks for antibodies (IgE) produced by the body as a sign of an allergy, or for immune cells involved in the allergic reaction.

September 7, 2022