IN THIS TOPIC
OTHER TOPICS IN THIS CHAPTER
By
Robert A. Barish
, MD, MBA, University of Illinois at Chicago;
Thomas Arnold
, MD, Department of Emergency Medicine, LSU Health Sciences Center Shreveport
Reviewed/Revised Jun 2022 | Modified Sep 2022
- Treatment
Topic Resources
Jellyfish belong to a group known as Cnidaria. Other Cnidaria include
Sea anemones
Corals
Hydroids (such as the Portuguese man-of-war)
(See also Introduction to Bites and Stings Introduction to Bites and Stings Many creatures, including humans, bite when frightened or provoked. Others include Alligators and crocodiles Iguanas Mites Ticks read more .)
Cnidaria cause more poisonings than any other marine animal.
Cnidaria have stinging units (nematocysts) on their tentacles. A single tentacle may contain thousands of them. The severity of the sting depends on the type of animal. The sting of most species results in a painful, itchy rash, which may develop into blisters that fill with pus and then rupture. Other symptoms may include weakness, nausea, headache, muscle pain and spasms, runny eyes and nose, excessive sweating, and chest pain that worsens with breathing. Stings from the Portuguese man-of-war (in North America) and the box jellyfish (in Australia in the Indian and South Pacific oceans) have caused death.
Treatment of Jellyfish Stings
Wash venom and remove tentacles from skin
Warm or cold soaks for relief of pain
The first step in treating an injury caused by a jellyfish in the oceans of North America is rinsing with seawater to wash away venom from the skin. Any pieces of tentacles should be removed with tweezers or, after two pairs of gloves are put on, fingers.
The type of rinse varies by the type of sting:
For jellyfish stings in nontropical waters and for coral stings, seawater rinse can be used.
For jellyfish stings in tropical waters, vinegar rinse followed by seawater rinse can be used. Fresh water should not be used.
For Portuguese man-of-war stings, saltwater rinse can be used. Vinegar should not be used as a rinse on injuries from the Portuguese man-of-war because it can cause additional venom to be released from nematocysts that have not yet stung (“unfired" nematocysts).
For the more dangerous box jellyfish, in contrast, vinegar should be used for stopping additional “firings” of nematocysts, and then seawater should be used because fresh water will cause additional venom to be released.
For all types of stings, after the tentacles have been removed, hot or warm water soaks or cold packs, whichever feels better to the person, can help relieve pain.
At the slightest sign of breathing problems or altered awareness (including unconsciousness), medical help should be sought immediately.
Seabather's eruption
Seabather’s eruption is a stinging, itchy rash that affects swimmers in some Atlantic locations (such as Florida, the Caribbean, and Long Island). It is caused by an allergic reaction to stings from the larvae of the sea anemone or the thimble jellyfish. The rash appears where the bathing suit contacts the skin. People who suspect they have been exposed to these larvae should shower after taking off their bathing suit. Rashes can be treated with hydrocortisone lotion and, if needed, an oral antihistamine. If the reaction is more severe, people may need to seek medical help.
Drugs Mentioned In This Article
| Generic Name | Select Brand Names |
|---|---|
hydrocortisone | A-Hydrocort, Ala-Cort, Ala-Scalp, Alkindi, Anucort-HC, Anumed-HC, Anusol HC, Aquaphor Children's Itch Relief, Aquaphor Itch Relief, Balneol for Her, Caldecort , Cetacort, Colocort , Cortaid, Cortaid Advanced, Cortaid Intensive Therapy, Cortaid Sensitive Skin, CortAlo, Cortef, Cortenema, Corticaine, Corticool, Cortifoam, Cortizone-10, Cortizone-10 Cooling Relief, Cortizone-10 External Itch Relief, Cortizone-10 Intensive Healing, Cortizone-10 Plus, Cortizone-10 Quick Shot, Cortizone-5 , Dermarest Dricort, Dermarest Eczema, Dermarest Itch Relief, Encort, First - Hydrocortisone, Gly-Cort , GRx HiCort, Hemmorex-HC, Hemorrhoidal-HC, Hemril , Hycort, Hydro Skin, Hydrocortisone in Absorbase, Hydrocortone, Hydroskin , Hydroxym, Hytone, Instacort, Lacticare HC, Locoid, Locoid Lipocream, MiCort-HC , Monistat Complete Care Instant Itch Relief Cream, Neosporin Eczema, NuCort , Nutracort, NuZon, Pandel, Penecort, Preparation H Hydrocortisone, Proctocort, Proctocream-HC, Procto-Kit, Procto-Med HC , Procto-Pak, Proctosert HC , Proctosol-HC, Proctozone-HC, Rectacort HC, Rectasol-HC, Rederm, Sarnol-HC, Scalacort, Scalpicin Anti-Itch, Solu-Cortef, Texacort, Tucks HC, Vagisil Anti-Itch, Walgreens Intensive Healing, Westcort |
VIEW PROFESSIONAL VERSION
Copyright © 2024 Merck & Co., Inc., Rahway, NJ, USA and its affiliates. All rights reserved.
Test your knowledge
Take a Quiz!
- About
- Disclaimer
- Permissions
- Privacy
- Cookie Settings
- Terms of use
- Licensing
- Contact Us
- Veterinary Edition
Copyright © 2024 Merck & Co., Inc., Rahway, NJ, USA and its affiliates. All rights reserved.
