Get out of the water immediately
Call emergency services if the person has trouble breathing, chest pain, fainting, severe swelling, or widespread hives
Rinse the sting area with seawater
Do not rub the area
Remove visible tentacles with tweezers or gloved hands
Rinse the area with vinegar if available
If vinegar is not available, follow local first-aid guidance for the specific jellyfish type
Soak the area in hot water, about 104 to 113°F, for 20 to 45 minutes
Use a cold pack if hot water is not available
Take an oral pain reliever if needed and safe to use
Monitor for worsening symptoms
Seek medical care if pain is severe, symptoms spread, or the sting is from a box jellyfish or other dangerous species