If you are stung by a jellyfish in 2026, the immediate first step is to rinse the area with vinegar for at least 30 seconds. Vinegar (acetic acid) is a weak acid that helps deactivate any undischarged stinging cells (nematocysts) remaining on the skin, particularly for dangerous species like the Box Jellyfish. If vinegar is not available, rinse with seawater, not fresh water, as fresh water can trigger more stinging cells to fire. Once the area is rinsed, use tweezers or the edge of a plastic card to carefully remove any remaining tentacles without rubbing the skin. For pain relief, the most effective method is to soak the affected area in hot water (roughly 45°C or 113°F) for 20 minutes; hot water is now considered superior to ice for most stings because it helps break down the jellyfish venom's proteins. Avoid old myths like using urine or alcohol, which can actually make the sting worse. If the victim shows signs of an allergic reaction—such as difficulty breathing, swelling of the face, or a rapid pulse—seek emergency medical attention immediately, as some stings can be life-threatening.