The Tiny Irukandji Jellyfish Can Cause a Terrifying Sense of Impending Doom

Tiny Irukandji jellyfish can trigger severe illness, including intense pain, vomiting, cramps, sweating and a terrifying sense of impending doom.

Biology

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The Irukandji is a group of tiny box jellyfish found mainly in warm tropical waters around northern Australia. Some species are less than an inch across, yet their stings can trigger Irukandji syndrome, a severe illness that can include intense pain, headache, nausea, vomiting, muscle cramps, heavy sweating, breathing trouble and a striking feeling that death is imminent. The initial sting may be easy to overlook, with more serious symptoms developing later rather than immediately. Researchers still do not have a complete explanation for why the venom can produce such an intense sense of impending doom. Studies suggest that the venom can affect the body systems involved in the stress response, including adrenaline and noradrenaline, but the exact mechanism remains uncertain. Treatment focuses on controlling pain and other dangerous symptoms while the effects of the venom wear off. There is no simple specific antidote for Irukandji syndrome. The jellyfish are difficult to spot because of their tiny, nearly transparent bodies, making accidental encounters possible for swimmers. Human stings are uncommon, but severe cases can require hospital care because of major changes in blood pressure, heart rate and other body functions. The combination of extreme physical symptoms and an unusually intense psychological sensation is what makes Irukandji stings especially notorious.

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