Most jellyfish stings can be treated right away with a salt water or hot water rinse. This will help decrease the burning sensation from the sting. It may also help to take a hot shower as soon as possible. A recent study concluded that jellyfish stings are treated more effectively by hot water than by ice packs.
First-aid care
Most jellyfish stings are painful but not dangerous. A few jellyfish, however, release powerful venom into the skin. The stings of these species, if left untreated, can be dangerous or even deadly. Prompt jellyfish sting treatment can quickly alleviate pain and prevent a sting from getting worse.
The study found that vinegar chemically prevents the stinging cells, called cnidae, from injecting you with more venom. "If you douse with vinegar or spray with vinegar you will irreversibly inhibit discharge," said Angel Yanagihara, a co-author of the study.
Treatment can vary based on the type of jellyfish most common in the area. Often, it's best to rinse a sting with vinegar. Vinegar is a weak acid that might keep the stingers from firing for some kinds of stings (especially from dangerous types like box jellyfish).
Symptoms of severe jellyfish stings include: Stomach pain, nausea and vomiting. ... Symptoms