Caused by certain jellyfish from the Cubozoa class (box jellyfish) species
Usually develops within 2 hours of envenomation & can last up to 2 days 
The sympathomimetic-like manifestations are due to the venom, which is proteinaceous and contains a neural sodium channel activator.
Acts on the same sodium channels that are sensitive to tetrodotoxin, causing the release of catecholamines, particularly norepinephrine and epinephrine, and also direct vasoconstrictor effects.
Acts on the same sodium channels that are sensitive to tetrodotoxin, causing the release of catecholamines, particularly norepinephrine and epinephrine, and also direct vasoconstrictor effects.
Irukandji syndrome
Toxins
Twiddler's syndrome
Ciguatera
Horner syndrome
Scombroid
Bell's palsy
Tetrodotoxin 