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The symptoms of a jellyfish sting are varied and can depend on the severity of the sting. You may experience pain that feels burning or prickling, sort of like a sunburn, what looks like a print of the tentacles on the part of the body that got stung, itching, swelling, and throbbing pain in your arm. More severe symptoms can include stomach pain, nausea, vomiting, a headache, muscle pain or muscle spasms, weakness, drowsiness, fainting, confusion, difficulty breathing, and heart problems. In rare cases, the jellyfish may cause you to get something called irukandji syndrome, which can cause chest pain, stomach pain, high blood pressure, and heart problems. There’s also a chance may have delayed hypersensitivity reaction, which will cause skin irritation to appear up to two weeks after the initial sting.