Why do jellyfish sting us?
Quick Answer
Jellyfish sting to capture prey and defend themselves using tiny stinging cells called nematocysts. These cells fire harpoon-like threads that inject venom on contact.
The Full Story
Jellyfish tentacles are lined with nematocysts, specialized cells that can fire rapidly when triggered by touch or chemical cues. The tiny harpoon-like structures inject venom into prey, immobilizing them for feeding. Humans are accidental victims when they brush against the tentacles, which is why stings can happen even from beached or torn-off tentacle fragments. Different species cause very different reactions, from mild irritation to severe injury. The sting is a highly evolved feeding weapon, not an act of aggression toward people specifically.
Key Facts
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