DefinitionBy Mayo Clinic staff
Jellyfish stings are relatively common problems for people swimming, wading or diving in seawaters. The long tentacles trailing from the jellyfish body can discharge thousands of microscopic barbed stingers that release venom into your skin.
Jellyfish stings can vary greatly in severity. Most often they result in immediate pain and red, irritated marks on the skin. Some jellyfish stings may cause more whole-body (systemic) illness, and in rare cases, jellyfish stings are life-threatening.
Most jellyfish stings get better with home treatment, but severe reactions require emergency medical care.
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