Allergies are one of the most common diseases in today's society, consisting of the reaction of the immune system to certain substances or elements of nature. The most common allergies are usually mites, pollen and fungi, although some more. Allergy to dust mites is one of the most difficult to treat because the mites are always present in our daily lives, especially in domestic dust, and settle in many places ( carpets, soft toys, mattresses&hellip ;), causing a series respiratory distress ( rhinitis and asthma ) and conjunctivitis. To mitigate the effects of dust allergy you should avoid moisture and ventilate rooms, also clean the vents, filters heating and air conditioning. In regard to pollen allergy is a seasonal type, unlike the previous ones that can manifest steadily, and is caused by the pollen of grasses, trees and weeds. Furthermore, allergy to fungi also has an environmental component as present in the water stains on buildings, rotten food or animal cages and terrariums. Symptoms of these types of allergies can be reduced by the administration of antihistamines, nasal decongestants and, if required, allergy shots (immunotherapy ).