An allergy is actually a category of hypersensitivity. Substances (called allergens) that nearly everyone people would suffer no problem from cause others' immune systems to go into overdrive. Here's what's happening 'under the hood'... ... read more
... read more
"A tiny capacity of dust, for example, may leave an otherwise sensitive person unaffected. On the other hand, over time, seeing as more dust mites carried on the particles enter the nasal cavities and sit in the sinuses, they release more and more material. The eventual result can be the familiar rhinitis or runny nose associated with that particular allergy."

9. Bacitracin, another topical antibiotic They make it difficult to concentrate. They craft us itch. They cause runny noses and watery eyes. They promote wheezing and a long list of other annoying symptoms. An allergy is actually a category of hypersensitivity. Substances (called allergens) that nearly everyone people would suffer okay from cause others' immune systems to go into overdrive. Here's what's happening 'under the hood'...
asthma treatment guidelin - dog skin allergies