What is it?
An allergy is a situation in which the body presents an immune response (defense) different from the expected protective response, causing undesirable changes. The term “allergy” comes from the Greek “allos,” meaning original status changes. So, allergy is a specific reaction of the body’s defense system to normally harmless substances. People who have allergies often are sensitive to more than one substance.
Types of allergens – substances that cause allergic reactions – include:
When the allergy affects the respiratory system, called respiratory allergy.
How it develops?
We think today that allergic diseases, in general, have complex and …