Healthdirect Free Australian health advice you can count on.

Medical problem? Call 1800 022 222. If you need urgent medical help, call triple zero immediately

healthdirect Australia is a free service where you can talk to a nurse or doctor who can help you know what to do.

beginning of content

Jellyfish stings

7-minute read

If you are stung by jellyfish in tropical waters and have more than one sting site, or experience extreme pain, breathing problems, nausea, vomiting or sweating, call triple zero (000) and ask for an ambulance.

Key facts

  • Jellyfish stings are common; most are painful, but not dangerous.
  • Dangerous jellyfish, such as box jellyfish, can be found in the tropical waters of Northern Australia and their sting can cause serious symptoms or even death.
  • If someone is stung in a tropical area, pour vinegar on the sting site for 30 seconds, remove any tentacles from the skin and take the person to hospital.
  • If someone is stung in a non-tropical area, wash the sting site with sea water, remove any tentacles and immerse the site in hot water.
  • Avoid swimming in the sea when there are warnings about jellyfish.

Are all jellyfish stings dangerous?

Jellyfish stings are common and most of them are painful but not dangerous. However, some jellyfish stings are dangerous and can cause a severe reaction or even death. It's important to know what to look out for.

How does a jellyfish sting happen?

A sting occurs when a jellyfish's tentacle touches a person's skin. Stinging cells on the tentacle (called nematocysts) shoot poisonous venom into the skin.

How severe the sting is depends on the species of jellyfish and how much of the tentacle touched the skin.

What types of jellyfish are there in Australia?

Dangerous jellyfish can be found in Northern Australian tropical waters. The most dangerous is the major box jellyfish. Its venom is very poisonous, and its tentacles are long and likely to touch more of the skin.

Other types of box jellyfish in Northern Australian waters can cause Irukandji syndrome. This is where a person experiences extreme pain in their body, not necessarily at the location of the sting. The reaction may not occur until half an hour after the jellyfish has stung. This type of sting can be dangerous and requires emergency medical treatment. These types of jellyfish are small and their sting may not be noticed at first.

The most common type of stinging jellyfish is the bluebottle. These are found in non-tropical areas, especially along the south-eastern coastline of Australia. Their stings are painful, but they don't usually need medical treatment.

What does a jellyfish sting feel like?

Major box jellyfish

Where the jellyfish tentacles have touched the skin, there will be immediate severe pain and red whip-like lines.

If there has been a large area of contact, the person's heart may stop, causing death. This can happen within a few minutes. Children are at especially high risk because they are smaller.

Other types of box jellyfish

The sting itself is usually mild. Irukandji-like symptoms can occur 20 – 30 minutes after the sting and include:

  • severe pain in the body (back, abdomen and chest)
  • increased heart rate (tachycardia)
  • trouble breathing
  • anxiety and sweating
  • nausea and vomiting

Sometimes, a sting can cause fluid in the lungs and damage to the heart.

Bluebottle jellyfish

Bluebottle jellyfish stings can cause intense pain, whip-like lines and sores in the areas of skin that have been in contact with the jellyfish tentacles. The pain usually decreases or stops after 1 – 2 hours and you may have joint aches afterwards. You may also have a rash or redness in the area that was stung.

Sometimes these stings can cause an allergic reaction.

What should I do if someone has been stung by a jellyfish?

In tropical areas, call triple zero (000) and ask for an ambulance if there are multiple sting sites or if the person who was stung seems unwell.

It can be hard to know which species of jellyfish has stung you. If you are in the tropics in Australia and you aren't sure what type of jellyfish it is, treat any sting as if it is a sting by a box jellyfish.

If you are sure the person was stung by a bluebottle jellyfish, and the person is well with a single sting site, treat them as for a non-tropical jellyfish sting.

Get help from a lifeguard if you can.

Tropical areas

Get the person out of the water. Call triple zero (000) and ask for an ambulance if the person has more than one sting site or is unwell.

Start the following first aid:

  • If the person is unconscious, perform cardiopulmonary resuscitation (CPR).
  • Pour vinegar on the jellyfish stings for 30 seconds. This stops any tentacles (nematocysts) that haven't already fired venom from firing. If vinegar is not available, wash the stings with sea water.
  • If vinegar isn't available, carefully remove the tentacles from the skin by flicking them off with a stick, or with your fingers (you may experience minor stinging). It's a good idea to wear gloves if they are available. Rinse the site with seawater.
  • Use a cold pack for pain relief after you have treated the sting with vinegar.
  • Take the person to hospital as they may need further treatment such as antivenom, strong pain relief or heart monitoring.

Don't let fresh water get onto the sting — this can cause more venom to be released.

Don't rub the sting site.

Non-tropical areas

Get the person out of the water and perform the following first aid:

  • Wash the sting site with sea water and remove any tentacles.
  • For pain relief, immerse the sting site in hot water for 20 minutes. Make sure the hot water will not burn the person. It should be as hot as they can tolerate — up to 45 degrees Celsius. The person can also have a hot shower.

If it doesn't help, or if there is no hot water, use an ice pack or cold running water instead.

Vinegar should not be used for bluebottle stings — it can cause more venom to be released and may increase the person's pain.

Don't rub the sting site.

Call triple zero (000) and ask for an ambulance if:

  • the sting is on the face or neck
  • the sting covers a large area
  • the person is unwell or having trouble breathing
  • the pain doesn't improve

How can I prevent jellyfish stings?

Some things you can do to help prevent jellyfish stings include the following:

  • Avoid swimming in the sea when there are warnings about jellyfish.
  • Don't touch any jellyfish in the water or on the beach.
  • Wear a full-body Lycra wetsuit and waterproof footwear.

It's a good idea to swim near a lifeguard who will be able to give you first aid or call an ambulance for you.

Learn more here about the development and quality assurance of healthdirect content.

Last reviewed: October 2022


Back To Top

Need more information?

These trusted information partners have more on this topic.

Top results

Irukandji jellyfish

The Irukandji jellyfish is a small jellyfish approximately two centimetres in diameter, making it difficult for swimmers to notice in the water.

Read more on Queensland Health website

Jellyfish | NT.GOV.AU

Irukandji syndrome, treatment for and prevention of jellyfish stings.

Read more on NT Health website

Box jellyfish

Box jellyfish, commonly called stingers in northern Australia, are found from October to May in coastal waters off tropical Australia, from Bundaberg in Queensland to Geraldton in Western Australia.

Read more on Queensland Health website

Bites and stings | NT.GOV.AU

Bites and stings from bats, insects, caterpillars, jellyfish and mosquitoes.

Read more on NT Health website

First aid for bites and stings - MyDr.com.au

First aid tips for bites and stings from some of the most venomous creatures in the world - snakes, spiders, jellyfish, blue ringed octopus and cone snail - all of which are found in Australia.

Read more on myDr website

Bites and stings – first aid - Better Health Channel

First aid information about what to do If for common bites and stings. Includes - spiders, snakes, scorpions, bees, ticks, wasps, octopus, jellyfish and other sea creatures.

Read more on Better Health Channel website

Bluebottle stings - MyDr.com.au

Carefully remove any remaining bluebottle tentacles by gently washing the area in sea water, taking care to avoid further stings.

Read more on myDr website

Bites and stings quick guide

Read more on St John Ambulance Australia website

Raising kids in tropical Australia

Growing up in northern Australia can be a magical and safe experience. But parents need to be aware of the risks posed by life in the tropics.

Read more on Pregnancy, Birth & Baby website

Bites and stings | Health and wellbeing | Queensland Government

11 of the worlds 12 most poisonous snakes live in Australia. Although relatively few bites and stings are seriously dangerous to humans, it may be difficult to distinguish which bites and stings are serious from those which are not. Basic first aid procedures should be applied in all circumstances followed promptly by appropriate medical treatment.

Read more on Queensland Health website

Healthdirect 24hr 7 days a week hotline

24 hour health advice you can count on

1800 022 222

Government Accredited with over 140 information partners

We are a government-funded service, providing quality, approved health information and advice

Australian Government, health department logo ACT Government logo New South Wales government, health department logo Northen Territory Government logo Queensland Government logo Government of South Australia, health department logo Tasmanian government logo Victorian government logo Government of Western Australia, health department logo

Healthdirect Australia acknowledges the Traditional Owners of Country throughout Australia and their continuing connection to land, sea and community. We pay our respects to the Traditional Owners and to Elders both past and present.