Allergy: An itch that goes around the world All over the world, allergies are counted as one of the most common chronic diseases that impact millions of people every day. What makes them so common is the fact that they are an umbrella term for a plethora of diseases with different subtypes and affecting different organs: allergic rhinitis or inhalant allergy (eyes, nose, and airways), allergic asthma (lungs and airways), food allergy (mouth, skin, and systematic symptoms), eosinophilic esophagitis (respiratory and digestive tract), anaphylaxis (systematic symptoms), atopic dermatitis (skin), insect allergy (skin and systematic symptoms