Why Do Jellyfish Sting?

Jellyfish sting because they have tiny little stingers called nematocysts on their tentacles. When a person touches them, the stingers pop open and poke the skin, releasing little toxins that cause pain and sometimes an itch or redness.

Think of it like tiny needles hidden in your hair, when you brush against something with those needles, they shoot out and make you feel a sting. That's how jellyfish protect themselves from bigger animals (and swimmers)!

Jellyfish can be found in oceans all over the world, from cold northern seas to warm tropical waters. Different types of jellyfish live in different places, and some have stronger stings than others. For example, the box jellyfish is known for having one of the most painful stings in the ocean, while others might only give you a small itch or tingle.

Even though they're found all over the world, not every place has the same kinds of jellyfish. Some live near the shore and are easy to see when you're swimming, while others drift far out at sea. That means people in different parts of the world might have very different experiences with jellyfish stings, depending on which kind they happen to touch.