ComplicationsBy Mayo Clinic staff
In most cases, jellyfish stings don't cause long-term complications.
Some people experience a delayed hypersensitivity — an allergy-like reaction to the venom — that may produce blisters, rash or other skin irritations a week or more after the jellyfish sting.
Others who are highly sensitive to jellyfish venom can develop a severe, potentially life-threatening allergic reaction (anaphylaxis) on exposure to jellyfish. A flood of chemicals released by your immune system during anaphylaxis can cause you to go into shock. Your blood pressure drops suddenly, and the narrowing of airways block normal breathing.
In rare cases jellyfish stings can cause:
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