Jellyfish are common in Florida, but they are not everywhere all of the time. These creatures range in size from tiny to several feet in diameter, with tentacles hanging below. While most jellyfish do not sting, Florida has several species that can sting.
Contact with tentacles (even those that have broken off) can cause red, raised streaky welts that can last from 1-2 weeks and cause severe pain, tingling, itching, and even nausea and headache. Do not touch jellyfish that have washed up on the beach; even dead jellies can sting! The best advice is to look but don't touch. Florida Health Department Brochure about Jellyfish