Why do people have allergies?

From that causes sneezing, tears or tantrums.

For someone with allergies, even something small can cause big problems. Seemingly harmless dust particles, inflammation of a cat, or a flower pollen breeze can lead to symptoms alergjish.

Probably wondering why the human body reacts in a way? Why not have or do not have sneezing? Why nose or the eyes fill with tears? Basically, an allergy is the body's reaction to a threat misinterpreted, something that is usually harmless. When you exposed to an allergen, the body responds by trying to block it.

To some people, these harmless substances can cause an immune response in the body to save the last of these "invaders". The body produces an antibody called IgE (immunoglobulin E), which clings to cells called mast. This triggers the release of various substances, including histamine, which causes allergy symptoms.

It's good to know that your immune system is working so hard to protect you, but for those with seasonal allergies all year long, this protection usually leads to inflammation, writes Annabel. It's exactly the inflammatory response that causes the strange feeling and the need for sneezing.

Your eyes can pass into defensive position also creating tears and blood vessels may swell and give you the look as swollen or red eye.