The poisons in marine organisms are collectively referred to as marine toxins. Marine toxins are found in various tissues of various marine organisms, and their chemical composition and mechanisms of action also vary greatly. From their effects on human health, they are largely differentiated between the stinger and venom type, and the type known to cause food poisoning. Here, in addition to introducing the main marine toxins to cause food poisoning, I would also like to point out how global warming plays a role in spreading marine toxins both geographically and between species, and how it greatly impacts food security.