What causes allergies, and why are some people more affected?

Allergies happen when your body thinks something harmless is actually dangerous, and it gets excited about it.

Imagine you're playing with your favorite toy, and suddenly someone throws a big pile of confetti on top of it. Your brain goes “Wait, what’s that?!” and you start jumping around, thinking the confetti is part of a super fun game. That’s like having an allergy, your body sees something normal (like pollen or chocolate) and thinks it's a surprise party, so it sends out tiny helpers to fight it off.

Allergies are caused by the immune system, which is like the body’s security team. Normally, this team protects you from real dangers, like germs. But sometimes, it mistakes harmless things for threats and overreacts, that’s when you get sneezing, itching, or even a rash.

Some people have a stronger immune system reaction, like having a security team that's extra alert and ready to jump in at the first sign of trouble. Others might be more relaxed about the confetti, they don’t mind it as much.

Also, if your family has allergies, you're more likely to get them too. It’s kind of like having a toy that your brother or sister loves, you might end up loving it too!