Jellyfish Stings: There are over 200 types of jellyfish. Some are not poisonous, however, some are very poisonous and may lead to coma or death. Symptoms of a jellyfish sting include:

• stinging pain,
• rash,
• itching, and
• raised welts.

More serious symptoms include nausea, vomiting, abdominal pain, diarrhea, or muscle spasms. Treatment depends on the type of jellyfish. Some may require immediate hospitalization.