“You should pee on a jellyfish sting to neutralize it.”

The idea of using urine as a remedy for a jellyfish sting is a widespread misconception, often perpetuated by popular culture and anecdotal advice. This myth likely gained traction due to the immediate and often painful nature of a jellyfish sting, prompting individuals to try any readily available liquid in an attempt to alleviate discomfort. The urgency of the situation, coupled with a lack of accurate information, allowed this ineffective and potentially harmful practice to spread.

Scientifically, urine is not an effective treatment and can actually worsen a jellyfish sting. Urine's chemical composition and temperature are highly variable, but it is generally hypotonic compared to seawater. Applying a hypotonic solution like urine to a sting site can trigger undischarged nematocysts, the tiny stinging cells on the jellyfish tentacles, to fire more venom (Review) into the skin. This can intensify the pain and the severity of the reaction. The recommended first aid involves rinsing the area with vinegar, if available, or seawater to help deactivate the stinging cells, followed by carefully removing any remaining tentacles. Fresh water should also be avoided for the same reason urine is.

The persistence of this myth can be attributed to several factors. The immediate pain of a sting often leads to a desperate search for relief, and urine is a readily available, if misguided, option. Additionally, the discomfort from a jellyfish sting can sometimes subside on its own over time, leading people to falsely attribute the improvement to the urine application rather than the natural course of the sting. This reinforces the myth through perceived, but incorrect, success stories, making it a challenging misconception to fully debunk.