A surprise swarm of jellyfish turned a Waikiki beach day into a painful ordeal on Sunday, leaving multiple swimmers stung and at least four people treated by emergency crews along the busy shoreline. Honolulu EMS and lifeguards responded to calls near Kalakaua Avenue and Kalia Road as visitors reported sudden, sharp stings in shallow water. One adult was listed in serious condition, and a 3-year-old child was taken to a hospital by their parents.
EMS: Four Stung In Waikiki, One Seriously Hurt
Honolulu Emergency Medical Services told the Honolulu Star‑Advertiser that at least four people were stung and treated in Waikiki on Sunday.
According to the outlet, a 42-year-old man was treated for pain and transported to a hospital in serious condition. A 45-year-old man was taken to a hospital in stable condition from the 2400 block of Kalakaua Avenue. A 24-year-old man was evaluated at Kalia Road and declined transport, and a 3-year-old child was driven to the hospital by parents before EMS arrived.
Why Waikiki Gets Monthly Jellyfish Visitors
Box jellyfish typically show up near Waikiki about eight to ten days after a full moon, according to the Waikīkī Aquarium. The aquarium notes that the arrival dates are estimates, not guarantees, and reminds beachgoers to obey posted warnings and check with lifeguards before heading into the water.
First Aid Advice From Local Researchers
Researchers at the University of Hawaiʻi at Mānoa say some widely shared first aid tips for box jellyfish stings can actually make things worse. They report that tactics such as scraping off tentacles, rinsing with seawater or putting ice on the sting may increase injury.
The UH team recommends using vinegar to inactivate the stinging cells, followed by hot water immersion to help reduce pain. Their lab work indicates that heat can decrease venom activity, while some common responses may intensify the sting. Lifeguards and city officials post warning signs and advise swimmers to check in at lifeguard towers for the latest conditions.
Past Surges Show Why Warning Signs Matter
Honolulu has seen how quickly a calm day at the beach can turn into a jellyfish problem. Large influxes have sometimes produced dozens to hundreds of stings in Waikiki and nearby shorelines in a single event.
In one previous surge in Waikiki and Ala Moana, more than 150 stings were recorded at once, according to Hawaii News Now. This story will be updated if city officials or Ocean Safety release additional details about Sunday's incidents.
