Table of Contents
- Which first aid should you use?
- Jellyfish Sting First Aid: Quick Guide
- How do you treat a bluebottle sting?
- What should you do after a suspected box jellyfish sting?
- What are the symptoms of Irukandji syndrome?
- Where in Australia are dangerous tropical jellyfish found?
- What does a jellyfish sting look like?
- What does a jellyfish sting feel like?
- How do jellyfish sting?
- Do all jellyfish sting humans?
- Can clear jellyfish sting?
- Can a dead jellyfish still sting?
- Should you pee on a jellyfish sting?
- Why should you avoid fresh water and rubbing?
- Is hot water or a cold pack better?
- What is the fastest way to treat a jellyfish sting?
- How long does a jellyfish sting last?
- Can a jellyfish sting cause anaphylaxis?
- When should you call Triple Zero (000)?
- When should you see a doctor?
- How can you avoid jellyfish stings?
- Build practical first aid skills for bites and stings
- Sources
Call Triple Zero (000) if the person is unresponsive, is not breathing normally, has difficulty breathing, collapses, develops severe or widespread symptoms, appears seriously unwell, or may have been stung by a dangerous tropical jellyfish. Start CPR if the person is unresponsive and not breathing normally. Do not delay emergency care while trying to identify the jellyfish.
Jellyfish sting first aid in Australia depends on where the sting happened, the likely marine stinger involved and how the person is affected. There is no single treatment that is right for every jellyfish sting. A known bluebottle needs a different response from a suspected major box jellyfish or Irukandji-type sting. In tropical northern Australia, an unidentified sting needs a more cautious approach because potentially dangerous jellyfish may be present.
This guidance follows ANZCOR Guideline 9.4.5 – First Aid Management of Marine Envenomation.
Important: This article provides general first aid information and does not replace professional medical advice, emergency services or assistance from qualified lifesavers and lifeguards. If someone is seriously unwell, has difficulty breathing, is unresponsive or not breathing normally, or may have been stung by a dangerous tropical jellyfish, call Triple Zero (000).
Which first aid should you use?
| Situation | Immediate action | Vinegar? | Pain relief | When to call 000 |
|---|---|---|---|---|
| Known bluebottle / Physalia sting | Rest the person, remove remaining tentacles and rinse with seawater | No | Immerse the area in tolerably hot water at about 45°C for around 20 minutes. Do not cause a burn. | Serious or worsening symptoms, breathing problems, collapse, large sting area or significant deterioration |
| Suspected major box jellyfish sting | Call 000, remove the person from the water, start CPR if needed | Consider household vinegar for 30 seconds | Pain treatment is secondary to emergency care | Immediately |
| Suspected Irukandji-type sting | Call 000 for serious symptoms or suspected dangerous tropical exposure; urgent hospital assessment is required | May be considered in the potentially lethal tropical jellyfish context | Emergency assessment takes priority | Yes, for serious symptoms or suspected Irukandji syndrome |
| Other non-tropical jellyfish sting | Remove tentacles and rinse with seawater | Not as a blanket treatment | Apply a cold pack for pain relief | If the person becomes seriously unwell or develops systemic symptoms |
This table is designed to help with the first decision. You do not need to identify the exact species before providing urgent care.
Location, circumstances and symptoms are more useful than trying to diagnose a jellyfish from its colour, shape or the marks left on the skin.
Jellyfish Sting First Aid: Quick Guide
If someone has been stung:
- Remove them from the water if it is safe to do so.
- Seek assistance from a lifesaver or lifeguard if one is available.
- Keep the person at rest and monitor their condition.
- Call Triple Zero (000) for a suspected dangerous tropical sting or serious symptoms.
- If the person is unresponsive and not breathing normally, start CPR.
- Choose first aid based on the situation:
- Known bluebottle: remove remaining tentacles, rinse with seawater and use tolerably hot water for pain relief. Do not use vinegar.
- Possible potentially lethal tropical jellyfish: call 000. Consider household vinegar over the sting area for 30 seconds, then remove remaining tentacles.
- Other non-tropical jellyfish: remove tentacles, rinse with seawater and use a cold pack for pain relief in line with ANZCOR guidance.
- Stay with the person and watch for any deterioration.
Do not rub or scrape the sting site. Do not use urine as first aid.
How do you treat a bluebottle sting?
Bluebottles are among the most common marine stingers encountered around Australian coastal areas, especially along eastern and southern waters.
The bluebottle, a type of Physalia sometimes referred to as a Portuguese man-of-war, can cause immediate burning pain and a red line or welt where its tentacles touch the skin.
Most bluebottle stings cause a painful local reaction rather than life-threatening illness. However, more serious reactions can occur.
If the sting is clearly from a bluebottle, the person is stable and symptoms remain localised:
- Keep them at rest and reassure them.
- Do not rub the sting site.
- Carefully remove any remaining tentacles.
- Rinse the affected area with seawater.
- Place the stung area in hot water at about 45°C for around 20 minutes, provided the person can comfortably tolerate the temperature.
The water should be hot enough to provide pain relief but never hot enough to burn the skin.
If the area cannot be immersed, a hot shower may be practical.
If hot water is unavailable or does not relieve the local pain, apply a cold pack. Ice may be placed inside a dry plastic bag before being applied to the area. Do not put ice directly on the skin.
Should you use vinegar on a bluebottle sting?
No. Vinegar should not be used on a known bluebottle sting.
Use seawater to rinse the area and hot water for pain relief.
Do not use fresh water to rinse a bluebottle sting.
Seek medical assistance if:
- severe pain persists
- pain becomes generalised
- the affected area is large
- the sting involves the eye or another sensitive area
- breathing problems or other systemic symptoms develop
- the person's condition gets worse.
What should you do after a suspected box jellyfish sting?
A suspected major box jellyfish sting in tropical Australia is an emergency.
The Australian box jellyfish, Chironex fleckeri, occurs mainly in tropical coastal waters. It is almost transparent and can be difficult to see.
Its tentacles can extend up to about 3 metres, increasing the potential amount of tentacle contact with a swimmer.
A serious sting can cause intense pain, prominent whip-like marks and rapid systemic effects. In severe cases, breathing and heart function can be affected.
If a potentially lethal jellyfish may be involved:
- Call Triple Zero (000).
- Remove the person from the water if it is safe to do so.
- Seek help from a lifesaver or lifeguard.
- Check whether the person is responsive and breathing normally.
- If they are unresponsive and not breathing normally, start CPR immediately.
- Consider dousing the sting area with household vinegar for 30 seconds.
- Remove remaining tentacles.
- Stay with the person and monitor them while waiting for medical aid.
Do not delay 000 or CPR while looking for vinegar.
If vinegar is not available, continue emergency first aid rather than delaying care.
Vinegar is used to reduce further discharge from remaining stinging cells. It does not remove venom that has already entered the body.
Pressure immobilisation is not routine first aid for jellyfish stings. Do not apply snake-bite pressure immobilisation instructions.
Hospital treatment may include pain management, monitoring of vital signs and other supportive care.
Box jellyfish antivenom is available and may be used by medical professionals where clinically indicated. It is not a home first aid treatment and should not be purchased or self-administered.
What are the symptoms of Irukandji syndrome?
Some small tropical jellyfish can cause Irukandji syndrome.
The initial sting may cause only minor skin irritation or mild discomfort. No obvious tentacle may be visible.
More serious symptoms can then develop after a delay, often around 20 to 30 minutes, although timing can vary.
Possible symptoms include:
- severe back pain
- abdominal or stomach pain
- chest pain
- severe muscle pain or cramps
- headache
- nausea
- vomiting
- heavy sweating
- restlessness or agitation
- increased heart rate
- high blood pressure
- breathing difficulty
- intense anxiety or distress.
A person suffering Irukandji syndrome may become seriously unwell even though the initial sting looked minor.
Do not assume someone is safe because the original sting did not hurt much.
Suspected Irukandji syndrome requires urgent hospital assessment.
Call Triple Zero (000) if serious symptoms develop or a dangerous tropical jellyfish sting is suspected.
Where in Australia are dangerous tropical jellyfish found?
Potentially life-threatening marine stingers are mainly associated with tropical and subtropical northern Australian waters.
Healthdirect advises using a cautious approach to an unidentified sting that occurs north of Bundaberg in Queensland or Geraldton in Western Australia.
These locations should not be treated as an absolute boundary between dangerous and non-dangerous waters. Marine stinger distribution can vary.
Always follow local warnings and advice from lifesavers or lifeguards.
When is jellyfish season in northern Australia?
Tropical stinger risk changes with location, water conditions and weather.
The height of tropical marine stinger season is generally from November to May.
Risk is usually higher during the warmer months, but potentially dangerous species may not follow an exact calendar.
Do not assume the water is safe simply because you are outside the usual jellyfish season.
Check beach warning signs and local advice before entering the water.
What does a jellyfish sting look like?
The appearance of the sting varies with the species, the amount of tentacle contact and the person's reaction.
Possible signs include:
- red lines
- raised welts
- redness
- swelling
- local inflammation
- whip-like marks
- blotchy areas
- blistering.
A bluebottle often leaves a red line along the area where its tentacles made contact.
Major box jellyfish can cause severe red or whip-like marks.
However, appearance alone cannot reliably identify the exact jellyfish.
Do not assume a mild-looking sting is harmless. Some tropical jellyfish associated with Irukandji syndrome may leave little obvious skin damage before more serious symptoms develop.
What does a jellyfish sting feel like?
Many stings cause immediate sharp or burning pain.
People may experience:
- sharp pain
- burning
- stinging
- intense local pain
- a sudden hot or electric sensation.
A bluebottle can cause intense pain that lasts for an hour or longer.
Major box jellyfish often cause severe immediate pain.
Irukandji-associated stings can be different. The initial contact may cause relatively little discomfort before severe symptoms develop later.
The amount of pain at the moment of the sting should therefore not be used as the only measure of severity.
How do jellyfish sting?
Jellyfish tentacles contain microscopic stinging cells called nematocysts.
A nematocyst is a tiny venom-delivery structure. When triggered, it rapidly fires into the skin and releases venom.
Some tentacles and unfired stinging cells can remain on the skin after contact.
This helps explain why rubbing, scraping and inappropriate rinsing should be avoided.
Greater tentacle contact can increase potential venom exposure, but the severity also depends on the species and the person's response.
Do all jellyfish sting humans?
Different jellyfish species affect people in different ways.
Some have little or no medically important effect on humans.
Others cause painful local reactions.
A small number of Australian tropical species can cause life-threatening envenomation, meaning venom has entered the body and is causing serious effects.
It is therefore inaccurate to say that every jellyfish is dangerous.
It is also unsafe to assume that an unfamiliar or harmless-looking jellyfish cannot sting.
Can clear jellyfish sting?
Yes.
Transparency does not mean a jellyfish is harmless.
Major box jellyfish can be almost transparent and difficult to see in shallow water.
Do not deliberately touch a clear or unidentified jellyfish to find out whether it can sting.
Can a dead jellyfish still sting?
A washed-up jellyfish or detached tentacle may still contain active stinging cells.
Avoid touching jellyfish or loose tentacles in the water or on the beach.
Children should be taught not to pick up or play with washed-up jellyfish.
The fact that an animal appears dead does not mean its tentacles are safe to handle.
Should you pee on a jellyfish sting?
No. Urinating on a jellyfish sting is not recommended Australian first aid.
Urine is not a reliable treatment and should not replace recognised first aid.
Instead:
- for a known bluebottle, use seawater and tolerably hot water
- for a suspected dangerous tropical jellyfish, prioritise 000, CPR when required and guideline-appropriate use of vinegar.
Do not use urine as an alternative if vinegar is unavailable.
Why should you avoid fresh water and rubbing?
Do not rub, scrub or scrape the sting site.
Rubbing can disturb remaining tentacles and microscopic stinging cells.
Do not try to remove tentacles by rubbing the skin with:
- sand
- a towel
- a card
- clothing.
Fresh water should not be used to rinse a known bluebottle sting because it may cause remaining unfired stinging cells to discharge.
Use seawater instead.
Avoid unverified home remedies such as:
- urine
- alcohol
- methylated spirits
- ammonia
- baking soda
- rubbing with sand.
Follow current Australian first aid guidance instead.
Is hot water or a cold pack better?
It depends on the type of sting.
Known bluebottle
Hot water is the preferred pain-relief approach.
Use water at about 45°C for around 20 minutes, provided it is comfortably tolerable and cannot burn the person.
If heat is unavailable or ineffective, apply a cold pack.
Other non-tropical jellyfish
Where the sting is not from a bluebottle and a dangerous tropical species is not suspected, follow ANZCOR guidance and use a cold pack for local pain relief after removing tentacles and rinsing with seawater.
Potentially dangerous tropical jellyfish
Pain treatment is not the first priority.
The primary objective is to preserve life.
Call Triple Zero (000), seek lifesaver assistance and commence CPR if the person is unresponsive and not breathing normally.
Do not delay emergency care to organise hot water or ice packs.
What is the fastest way to treat a jellyfish sting?
There is no single fastest cure.
The correct treatment depends on the likely species, location and symptoms.
For a stable person with a known bluebottle sting, prompt hot-water treatment can help reduce local pain.
For a suspected major box jellyfish or serious tropical sting, the fastest useful action is to:
- call Triple Zero (000)
- remove the person from the water safely
- obtain lifesaver assistance
- start CPR if required.
Do not delay life-saving treatment while looking for a home remedy.
How long does a jellyfish sting last?
There is no fixed recovery time.
Bluebottle pain can last an hour or longer. Redness and skin irritation may continue after the strongest pain has settled.
Some people may have lingering:
- itching
- redness
- tenderness
- local swelling.
More serious jellyfish envenomation can produce systemic symptoms and require hospital treatment.
Seek medical assistance if symptoms are severe, worsening, unusual or not settling.
Can a jellyfish sting cause anaphylaxis?
A jellyfish or other marine sting can cause anaphylaxis in some people, although severe allergic reactions are not the usual outcome of most stings.
Signs of anaphylaxis may include:
- difficult or noisy breathing
- swelling of the tongue
- swelling or tightness in the throat
- wheezing
- difficulty speaking
- persistent dizziness
- collapse.
If anaphylaxis is suspected, use the person's prescribed adrenaline autoinjector if available and follow their ASCIA Action Plan.
Lay the person flat and do not allow them to stand or walk. If breathing is difficult, allow them to sit with their legs outstretched. If unconscious or pregnant, place them in the recovery position — on the left side if pregnant. Hold young children flat rather than upright. Give adrenaline immediately if available, then call Triple Zero (000).
Begin CPR if the person becomes unresponsive and is not breathing normally.
When should you call Triple Zero (000)?
Call 000 if:
- a potentially dangerous tropical jellyfish may be involved
- the person is unresponsive
- the person is not breathing normally
- breathing becomes difficult
- the person collapses
- cardiac arrest occurs
- severe or widespread symptoms develop
- the person appears seriously unwell
- Irukandji syndrome is suspected
- a severe allergic reaction develops.
Remain with the person and continue monitoring them until medical aid arrives.
When should you see a doctor?
Seek medical assistance if:
- severe pain persists
- pain becomes generalised
- symptoms are getting worse
- the sting area is large
- the eye or another sensitive area is involved
- vomiting, dizziness or breathing problems develop
- the skin reaction is severe or unusual
- symptoms do not settle as expected.
A healthcare professional may assess the affected skin and check vital signs such as breathing, pulse and blood pressure.
For advice about bites, stings and possible poisoning, contact the Australian Poisons Information Centre on 13 11 26.
How can you avoid jellyfish stings?
You cannot remove every risk when swimming in Australian waters, but you can reduce your exposure.
To help avoid jellyfish stings:
- swim at patrolled beaches
- read marine stinger warnings
- ask a lifesaver or lifeguard about local conditions
- stay out of the water when beaches are closed because of stingers
- use designated stinger enclosures where available
- wear appropriate protective clothing or a stinger suit in high-risk tropical areas
- do not touch jellyfish in the water
- do not handle washed-up jellyfish or detached tentacles
- supervise children closely near the shoreline
- take particular care during the warmer months and tropical stinger season.
Stinger suits and enclosures can reduce risk, but neither provides absolute protection.
Build practical first aid skills for bites and stings
Knowing what to do before an emergency can make it easier to respond quickly when someone is injured.
HLTAID011 Provide First Aid develops practical first aid skills for responding to a range of injuries and emergencies.
You can also view Australia Pacific Training Solutions' full range of First Aid Courses. Run 5 days a week throughout Melbourne at our training locations or on-site.
People who work, travel or spend significant time in remote or isolated coastal areas may also consider HLTAID013 Provide First Aid in Remote or Isolated Site. This option is essential, particularly for working in mining.
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Where a workplace needs a broader level of first aid capability, speciality or the situations are more complex HLTAID014 Provide Advanced First Aid may also be relevant.
Australian Pacific Training Solutions delivers and assesses nationally recognised training on behalf of Allens Training Pty Ltd RTO 90909.
Organisations can also enquire about group first aid training where staff need consistent practical skills and scenarios relevant to their workplace.
