What causes allergies and how does the immune system respond?

Allergies happen when your immune system gets confused and overreacts to something harmless, like pollen or chocolate.

Imagine you're playing with your favorite toy. Most of the time, you don’t mind if someone else touches it, it's just a toy. But sometimes, if someone grabs it suddenly, you might get startled and shout, "That's mine!" Your immune system is kind of like that, it usually knows what’s safe, but sometimes it gets startled by something it thinks is dangerous.

When your body meets an allergen (like pollen or pet dander), it might think it’s being attacked. The immune system sends out tiny soldiers called antibodies, which are like little helpers that fight off invaders.

But if you've met the same allergen before, your immune system might be extra ready, and that's when things get loud! It sends out a bunch of signals, making you sneeze, itch, or even feel like you're going to burst into laughter (or tears).

So allergies are like a big, exaggerated toy fight, your body is just really excited about something that’s not actually a threat.