what are allergies

what are allergies

The subject what are allergies is described with complete aspects here under:-

what are allergies

An allergy is an exaggerated reaction of the immune system to a substance, which, in the majority of people causes no symptoms at all. The substance that triggers the allergy is known as an allergen. Examples of allergens include plant pollen, pet dander, insect venom, dust, mold, foods and drugs.

The body’s immune system makes an antibody, which is also a protein, called IgE, in response to being exposed to an allergen. People with allergies, make IgE antibody that is specific for the allergen that they are allergic to, which then in turn can cause allergy symptoms.

Furthermore, common conditions associated with allergies are sneezing, itching, nasal congestion and drainage and are referred to as allergic rhinitis, or more commonly, hay fever. Eye itching and swelling are referred to as allergic conjunctivitis. Asthma, eczema and hives can also be conditions associated with allergies.

How do allergies develop?

Allergies have a strong genetic component. If you have allergies, others in your family are likely to have allergies as well. As if one parent has allergies, a child has a 40% chance of having allergies. Further more, if both parents have allergies, there is a 7-8 in 10 chance that their offspring will have allergies. Even though children may be born with a predisposition to develop allergies, they do not always develop the same allergies as their parents.

Unlike eczema and food allergies, which may start at a young age, inhalant allergies usually require several pollen seasons to develop. The signs and symptoms of inhalant allergies are usually not apparent until 3 years of age or older. However allergies can develop at any age with symptoms occurring later in life.

Children with allergies are also more likely to develop asthma. It is estimated that 80% of children with asthma have evidence of allergies. Therefore, recognizing and treating allergies can have a significant impact on reducing asthma symptoms.


There are some symptoms that are commonly associated with allergies such as:

  • Runny nose

  • Post nasal drip

  • Sneezing

  • Congestion

  • Coughing

  • Itchy / Watery eyes

Less common allergy symptoms include:

  • Headaches

  • Loss of taste and smell

  • Poor concentration

  • Fatigue

  • Sleep disturbances

  • Snoring

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