Stings from jellyfish, which belong to a group of marine animals called coelenterates or cnidarians. Stinging capsules discharge when jellyfish tentacles are touched. Usually, the sting causes only a mildly painful or itchy rash, but some jellyfish and Portuguese men-of-war (other members of the same group) can cause a severe sting. Rarely, venom may cause vomiting, sweating, breathing difficulties, and collapse. Dangerous species live mainly in tropical waters. Antivenoms may be available.
Jellyfish stings |
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