Box Jellyfish: Identification, Venom, Stings, and Life-Saving First Aid Treatment

Identification

• Bell: square/box-shaped, four distinct sides.
• Tentacles: four clusters at bell corners, up to several meters long, covered in nematocysts (stinging cells).
• Color: transparent to vivid blue, pink, purple; some patterned.

Habitat and Distribution

• Warm tropical/subtropical coastal waters: bays, estuaries, coral reefs.
• Indo-Pacific (Australia, SE Asia, Pacific Islands), Caribbean, Gulf of Mexico, Brazil coast.

Venom and Sting Severity

• Complex protein/toxin mix affecting nerves, heart, skin.
• Symptoms: excruciating pain, skin necrosis, nausea, vomiting, muscle cramps, breathing difficulty.
• Severe cases: paralysis, cardiac arrest, death (especially Chironex fleckeri).

Prevention and First Aid

• Prevention: stinger suits/wetsuits in endemic areas; heed local warnings.
• Immediate treatment:
  1. Call emergency services.
  2. Douse area with vinegar (inactivates nematocysts)—do not rub.
  3. Carefully remove tentacles (gloved hand/tweezers).
  4. CPR if needed; antivenom in hospital for severe envenomation.

Box jellyfish stings are medical emergencies. Rapid vinegar application and professional care save lives.