What is Allergy?

[ausimsweb]

An allergy is a heightened sensitivity to a foreign substance (called an allergen) that causes the body's defense system (the immune system) to overreact when defending itself. Normally, the immune system would only react if a harmful substance, such as bacteria, attacks the body. For people with allergies, their immune systems are working too hard and react even when relatively harmless substances, such as pollen, are present. The severity of an allergic reaction can vary from mild discomfort to life threatening situations.
Allergens can stimulate an immune response when you breathe in or touch the allergen, or by ingestion of food or beverage, or from injections of medication.
Common allergies include eczema, hives, hay fever, and asthma. You can get an allergic reactions from food, pet dander, airborne pollen, and the venom of stinging insects, such as wasps and bees. Treatments for allergies include avoidance, use of anti-histamines, steroids or other medications, and immunotherapy to desensitize the allergic response.

General Allergy Symptoms

When you have an allergic reaction there may be a combination of the following allergy symptoms:

• sneezing
• wheezing
• nasal congestion
• coughing
• itchy, watery eyes
• runny nose
• itchy throat
• stomach ache
• itchy skin
• hives
• fatigue
• irritability

[niharikadutt]

Allergy is an hypersensitivity disorder of immune system.

[marion]

An allergy is a hypersensitivity disorder of the immune system. Symptoms include red eyes, itchiness, and runny nose, eczema, hives, or an asthma attack.

[sallie]

An allergy is a hypersensitivity disorder of the immune system. Symptoms include red eyes, itchiness, and runny nose, eczema, hives, or an asthma attack.

[rajamr]

Alergy is a kind of disease that may be visible in out layer of a body that troubles you

[iccwc2015]

Anything whichever body does not accepts is a form of allergy.

[bharatverma]

i am also suffering dust Allergy.... can anyone suggest me???

[boysingh]

An allergy is a hypersensitivity disorder of the immune system. Symptoms include red eyes, itchiness, and runny nose, eczema, hives, or an asthma attack. Allergies can play a major role in conditions such as asthma. - See more from and complete details from Wikipedia.

[shaunwool]

An allergy is the reply of the body that is immune system to usually harmless substances, like pollens, foods, and house dust mite.

[rubydaubert]

An allergy is the response of the body's immune system to normally harmless substances, such as pollens, foods, and house dust mite. Whilst in most people these substances (allergens) pose no problem, in allergic individuals their immune system identifies them as a’ threat’ and produces an inappropriate response.

[krishn1234]

When skin or body reaction, immune problem occurs from any natural thing then it is allergy.
Allergy we says when our body is effected from any substance.

[rahulthakur]

in simple words,when a reaction occurs in your body from any substance , then you are allergic to that substance.

[ElsieMcHenry]

Re

Allergy is the response of the body's immune system to normally harmless substances, such as foods, and house dust mite

[Karina]

I think that allergic reaction means your body can't accept this thing and signal you about stopping to use this. For example, my little daughter has an allergic reaction to some fruit and bright vegetables.

[charlesdickens]

It is an exaggeration of the body's natural immune defenses.