What is allergen?

An allergen is something that makes your body feel funny or sick because it thinks it’s under attack.

Imagine you’re eating a cookie, and suddenly your nose starts to run, and your eyes get all watery, poor you! That’s probably because the cookie had something in it called an allergen, like peanuts or milk. Your body didn’t realize it was just a snack; it thought it was fighting a tiny invader.

Think of your body as a detective who doesn’t always know what’s going on. When you eat something with an allergen, your detective friend (your immune system) gets confused and thinks the food is dangerous. It sends out special helpers to fight it off, causing sneezing, itching, or even a tummy ache.

Sometimes allergens are in foods, like eggs, wheat, or shellfish. Other times they’re in the air, like pollen from trees or dust mites. You might not always know what you're allergic to, but your body will let you know with a funny reaction!

So next time you feel sneezy after eating something new, it might just be your body’s way of saying, “Hey, I think I found an allergen!”