Allergies are an abnormal reaction by the person’s immunity against a normally harmless substance. Genetic predisposition is the major factor for example children from families with a history of allergy stand a higher risk of developing allergy.

Other factors include exposure to coldness and organic materials like pets’ fur, pollen, flakes form synthetic materials, smoke as well as fumes form chemicals.

The common indoor allergies include pet fur and dust mites. Avoidance of this trigger is important in the prevention and treatment of allergies. However avoiding outdoor allergy triggers e.g. plant pollens and moulds can be difficult since they are blown by air.