Medical Definition of Allergy & allergies symptoms.

Written by admin

What is Allergy?

Allergic reactions occur when your immune system reacts to a foreign substance-like pollen, bee venom, or pet dander & a food that most people don’t react to. 

An allergy is a chronic condition involving an abnormal reaction to a substance commonly called an allergen, allergens may also include aeroallergenic substances like dust mite, mold, tree weed and grass pollen, as well as food allergens such as milk, egg, soy, wheat, nut or fish proteins.

Allergies in Australia and New Zealand are very common and growing, affecting about 1 in 5 people at some point in their lives, allergy causes are many, and symptoms vary from mild to life threatening, the cause and persistence of asthma is also one of the major factors associated with allergy, for most allergies, there are effective prevention and treatment options available.

Your immune system produces antimicrobial substances, your immune system makes antibodies when you have allergies that identify a specific allergen as harmful, even if it is not, the reaction of your immune system can inflame your skin, sinuses, airways, or digestive system when you come into contact with the allergen.

The most common causes of allergic reactions in Australia are:

  • dust mites.
  • pollen (grass, weed or tree).
  • foods such as peanuts, cow’s milk, soy, seafood and eggs,
  • cats and other furry or hairy animals such as dogs, horses, rabbits and guinea pigs.
  • insect stings and tick bites.
  • medicines.


Allergy symptoms may affect your airways, sinuses, and nasal passages, skin, and digestive system, depending on the substance involved.
allergic reactions can vary between mild and severe, allergies can trigger a life threatening reaction called anaphylaxis in some severe cases.

  • Hay fever.
  • A food allergy.
  • An insect sting allergy.
  • A drug allergy.
  • A topic dermatitis.

Hay fever, also called allergic rhinitis, can cause:

  • Sneezing.
  • Hilarious, stuffy nose.
  • Itching of the mouth’s nose, eyes or roof.
  • Eyes that are watery, red or swollen (conjunctivitis).

A food allergy can cause:

  • Hives.
  • Anaphylaxis.
  • In the mouth, tingling
  • Lips, tongue, face or throat swelling.

An insect sting allergy can cause:

  • Anaphylaxis.
  • Itching or urination throughout the body.
  • A wide swelling area (edema) on the sting site.
  • Tough, tightness of the chest, wheezing or shortness of breath.

A drug allergy can cause:

  • Rash.
  • Hives.
  • Wheezing.
  • Yummy skin.
  • Anaphylaxis.
  • Swelling of the face.

A topic dermatitis, an allergic skin condition also called eczema, can cause skin to:

  • Itch.
  • Redden.
  • Flake or peel.

Seasonal Allergies, Symptoms, Diagnosis, & Treatment

Is It a Cold or an Allergy?



Allergy treatments include:

  • Allergen avoidance.
  • Medications.

Allergen avoidance:

Your doctor will help you identify your allergy triggers and avoid them. generally speaking, this is the most important step to prevent allergic reactions and to reduce symptoms.


Medications can help reduce the reaction of your immune system and ease the symptoms depending on your allergy. Your doctor may suggest medication over the counter or prescription in the form of pills or liquid, nasal sprays, or eye drops.

About the author


Leave a Comment