Advanced Knowledge of Allergy



Cause of allergy

  • When an allergen enters the body second time, it causes second immune response action and a subsequent allergic reaction occurs.


Forms of allergy

Examples of some forms of allergy are as follows:
  • Hay fever
  • Asthma
  • Anaphaylaxis


Entry routes of allergy

Different types of allergens enter the body through different routes such as:
  • Skin: When allergens like latex and insect stings come in contact with skin allergic reaction occurs. This reaction is characterized by the swelling, rashes, redness and inflammation. Skin allergy can last one to two days.
  • Mouth: Various types of foods are responsible for allergic reaction e.g., milk, egg, soy, nuts, fish even milk protein. Such allergens enter the body through the mouth only and cause inflammation in the digestive system.
  • Nose: Small particles and gaseous allergens enter the body through noseĀ e.g., pollen, spores, dust and chemicals. It is characterized by the coughing, sneezing, running nose, itching and watering eyes.


Symptoms and precautions of allergies

Signs and symptoms of allergy depend on the types of allergens and its mode of transmission such as
1. Respiratory disorders: Airborne allergen (pollen and dust) comes in contact with eyes, nose and lungs and causes respiratory disorders like:
a. Hay fever. It is characterized by sneezing, itching and redness of eyes, coughing and wheezing
b. Asthma: When the airborne allergen enters the lungs, it affects the bronchioles and can cause inflammation. It is characterized by shortness of breathing and wheezing.
2. Hives: when allergens like medicine or food enter the body and cause an allergic reaction. It is characterized by an outbreak of swollen, pale red bumps or patches on the skin.
3. Anaphylaxis (systemic allergic response): It is the sudden allergic reaction occurs due to insect bites, antibiotics and some medicines. It is characterized by the low blood pressure and shortness of breath.

1. Sudden cold and heat exposure should avoid.
2. Freshly prepared food should prefer.
3. Wash hand frequently



1. Allergy is the hypersensitiveness of a person to some foreign substance coming in contact with or entering the body.