Pain from a box jellyfish sting is almost immediate and there is a characteristic ‘ladder pattern’ on a stung area. Death from their sting can occur within 2–3 minutes. Severe generalised pain from an Irukandji sting may occur 5–40 minutes after a sting and you may see a faint red mark develop. Other signs and symptoms as well as treatment of marine envenomation are covered in your first aid training.