Allergy : The Known Culpits


Allergy is a hypersensitivity reaction towards a normally harmless substance. Whenever we are exposed or our body is irritated by any external agent or so called allergen, our body becomes vulnerable and reacts to get rid of it. Externally, it is reflected in the form of known symptoms like sneezing, itching, swelling, pain, redness etc. However, these symptoms are the resultant effect of cascade of reactions taking place within our body. This happens because our body’s defense mechanism becomes ready to fight with the allergen and throw it out of the body.

The mechanism initiates by the activation of IgE antibodies which tend to bind on the surface of mast cells. This process results in releasing of various chemical mediators that are responsible for producing local inflammation. ‘Histamine’ is one of the many chemical mediators released and performs two important functions to induce inflammation. Firstly, it promotes vasodilation which is relaxation of the blood vessels to allow easy flow of the white blood cells so that they can aggregate at the site of inflammation and fight the infection. Further, this vasodilation of the peripheral capillaries allows the plasma to escape through its walls which accumulates in the surrounding tissue space. These reactions results into various symptoms of allergy depending upon the part of the body affected.


Substances that provoke an allergic reaction are called ‘Allergens’. The ‘list’ of allergens can be best described by the dictum that “Everything under the sun including the Sun itself can act as a potential allergen”. This makes our body a virtual ‘battle field’ with different allergens attacking from various directions leading to various allergic manifestations.

Exogenic allergy is caused by various external allergens like dust, pollution, industrial waste, chemicals, insecticides, pesticides, food like eggs, nuts, preservatives etc. These allergens are actually just a ‘Tip of the Iceberg’. Our highly polluted environment compels us to inhale and ingest various chemicals that are potential allergens.

Allergens therefore appear to be unavoidable. We really can’t avoid dust, wheat or sun. Even human mother’s milk has been proven to contain various pesticides that are well recognized as allergens.


Pollution is a major factor which gives rise to Allergies; a dangerous side effect of our luxurious lifestyle……

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