07/08/2026 - 11:08 GMT+2
The presence of Portuguese man o' war, marine organisms with venomous tentacles**,** has increased this summer in northern Spain, especially in Cantabria and the Basque Country, where the authorities have had to restrict bathing and temporarily close several beaches after recording more than a hundred stings in a single day.
According to San Sebastián city council, most of the people treated had only minor injuries and the number of incidents was low compared with the volume of swimmers.
The Portuguese man o' war (Physalia physalis) is often mistaken for a jellyfish, but is in fact a colonial organism. Its long tentacles contain stinging cells capable of causing intense pain and, in some cases, severe reactions, so the authorities advise against any contact, even when the animal appears to be dead or has washed up on the sand.
What to do if you are stung
