What causes allergies and why do they seem to be more common now?

Allergies happen when your body thinks something harmless is actually dangerous, and it goes on a big defensive mission.

Imagine you're playing in the park, and suddenly a bunch of bees swarm around you. Your body gets scared and starts shouting, “Invaders! Invaders!” It sends out tiny helpers called white blood cells to fight them off. This is like your body’s version of a superhero team jumping into action.

Now, sometimes your body gets confused, it sees something normal, like pollen or pet dander, but thinks it's an invader. That’s what causes allergies: your immune system overreacts and makes you sneeze, itch, or feel stuffy.

Just like how you might get used to a new toy after playing with it every day, your body can also get used to things around you. But these days, there are more pollen, dust mites, and even cleaner environments than before.

In cleaner places, kids might not be exposed to as many germs early on. That means their immune systems don’t have as much practice telling the difference between real threats and harmless stuff, so they're more likely to think something like a flower’s pollen is an invader!

It's like if you only ever played with one kind of toy, you might not know how to handle a new game or a new friend.