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Dr. Chrysoula I. Liakou MD, PhD
- Treated online: Yes, after first aid: a doctor can assess pain, rashes, raised lines and spine wounds on camera.
- First aid: rinse with seawater, lift off tentacles or spines with tweezers or a bank card, then soak in water as hot as you can tolerate for at least 30 minutes.
- Vinegar: not for every jellyfish: it makes the stinging cells of the mauve stinger, common on Mediterranean beaches, fire more.
- Symptoms: intense pain, an itchy rash, and raised lines on the skin where the tentacles touched.
- Emergency: call 112 for difficulty breathing, chest pain, a seizure, severe swelling, vomiting, or feeling faint after a sting.
Do not book a video appointment if, after a sting from a sea creature, someone has difficulty breathing, chest pain, a seizure, severe swelling around the sting, severe bleeding or vomiting, or feels lightheaded or loses consciousness. Call 112.
Can an online doctor treat a jellyfish sting?
Yes, once first aid is done. The pain of most jellyfish stings eases with hot water and painkillers. A doctor by video can then look at the sting, check for an allergic reaction, infection or spines left in the skin, and treat the pain, itching and rash. Severe symptoms after a sting, such as breathing difficulty or chest pain, need 112.
How an online consultation helps after a jellyfish sting
- Warning signs checked first: Breathing difficulty, chest pain, severe swelling and vomiting are checked first, and you are sent to emergency care if any is present.
- The sting seen on camera: The doctor looks at the raised lines, the rash or the puncture marks, and checks for spines left in the skin.
- Pain and itch relief: Painkillers, an antihistamine or a steroid cream, chosen after the doctor checks your other medicines.
- Healing checked: Signs of infection, a rash that comes back, or a wound that does not heal are reviewed and treated.
What the doctor checks in an online jellyfish sting consultation
The consultation follows a fixed order, and the warning signs come first. The doctor asks about:
- Warning signs: breathing difficulty, chest pain, severe swelling, vomiting, or feeling faint.
- The sting: what stung you, where on the body, when, and what first aid you used.
- Spines and tentacles: whether any are still in the skin, and how deep the wounds are.
- Infection: increasing pain, redness, warmth or pus, a high temperature, or a wound that is not healing.
- Your health: allergies, long-term conditions and the medicines you take.
Before the call, finish the hot-water soak, and find good light so the doctor can see the sting.
Jellyfish sting first aid
Act straight away:
- Get out of the water, and ask a lifeguard or someone trained in first aid for help.
- Rinse the area with seawater, not fresh water.
- Lift off any tentacles or spines with tweezers or the edge of a bank card. Do not touch them with bare hands.
- Soak the area in very warm water, as hot as can be tolerated without scalding, for at least 30 minutes. Test the water on unstung skin first. If you cannot soak it, use hot flannels or towels.
- Take paracetamol or ibuprofen for the pain.
What not to do
- do not urinate on the sting
- do not put ice or a cold pack on it
- do not touch tentacles or spines with bare hands
- do not cover or close the wound
Should you use vinegar?
Usually not in European waters. Health services in Wales and Ireland advise against vinegar, and the Irish advice keeps it for tropical stings. Researchers at the Institute of Marine Sciences in Barcelona found that vinegar stops the stinging cells of one Mediterranean box jellyfish from firing, but makes those of the mauve stinger, Pelagia noctiluca, fire more, and the mauve stinger is behind most jellyfish stings on Mediterranean beaches. Follow the advice of the lifeguards, who know the local species.
Jellyfish sting symptoms
A sting from a jellyfish or a Portuguese man o’ war usually causes:
- intense pain where you were stung, which can burn, throb or itch
- an itchy rash, which can show red, purple or brown patches
- raised lines on the skin where the tentacles touched
A lion’s mane sting can also cause nausea, sweating, cramps and headaches. Some people react far more strongly. Breathing difficulty, chest pain, a seizure, severe swelling, vomiting or feeling lightheaded after a sting need 112.
How long does a jellyfish sting last?
Most jellyfish stings improve within a few hours. The rash from some stings lasts for weeks, and a scar can remain. A sting that is still itchy after a few weeks needs a doctor to look at it.
How do jellyfish sting?
Jellyfish sting with their tentacles. The tentacles carry stinging cells called nematocysts, a single tentacle can hold thousands of them, and they fire venom into the skin on contact. Jellyfish use them to catch prey and to defend themselves: they do not target people, and most stings happen when a swimmer brushes against the tentacles.
- Dead jellyfish still sting: the tentacles keep their venom, and stinging cells can fire even when detached, so keep away from jellyfish washed up on the beach.
- Pieces left on the skin: they can sting again, which is why the first step is rinsing with seawater and lifting them off.
- Fresh water: it can make the pain worse, so rinse with seawater instead.
- How common: an estimated 150 million people worldwide are stung each year.
Not every sting hurts much: skin is a natural barrier to most stings in UK and Irish waters.
Which jellyfish sting in UK, Irish and Mediterranean waters?
Most have mild stings, but a few cause real pain. The species you are most likely to meet:
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| Jellyfish | How to recognise it | Sting | Where and when |
|---|---|---|---|
| Moon jellyfish | Translucent, plate-sized bell with four circles | Very mild | The most common in UK seas; often washed up |
| Compass jellyfish | Yellowish-white bell with brown V-shaped markings, like a compass; up to 30 cm | Nasty: look, but do not touch | A summer visitor, from May to October; often washed ashore |
| Lion’s mane jellyfish | Brown to reddish, with hundreds of long, hair-like tentacles; usually 50 cm across, up to 2 m | Very painful: the most serious jellyfish in Irish waters | Mostly in more northerly waters |
| Blue jellyfish | Blue or yellow dome, up to 30 cm | Mild | UK and Irish coasts |
| Barrel jellyfish | One of the largest in UK seas, up to 1 m across, with a violet fringe | Mild | Often washed up in May and June |
| Mauve stinger | Small, bluish-purple bell with orange-brown warts, up to 10 cm; tentacles up to 3 m | Painful | Behind most stings on Mediterranean beaches; fairly uncommon in the UK |
| Portuguese man o’ war | Not a true jellyfish but a floating colony, with tentacles that can be tens of metres long | Powerful, and can be dangerous | Rare in UK waters, though large numbers washed up in south-west England in autumn 2020 |
Ireland has five native species: the moon, compass, blue, barrel and lion’s mane jellyfish. The mauve stinger turns up occasionally, and the Portuguese man o’ war only rarely.
On Mediterranean beaches, the mauve stinger, Pelagia noctiluca, causes the most stings. Carybdea marsupialis, a box jellyfish, is one of the most venomous jellyfish in the Mediterranean, and vinegar does help with its stings. Because the right first aid can differ between species, lifeguards and local beach signs are the best guide to what is in the water.
Stepped on a sea urchin?
Sea urchins live in shallow water and on rocky seabeds, and their spines break off in the skin when you tread on or touch one. First aid:
- Soak the area in water as hot as you can tolerate, without scalding, for at least 30 minutes.
- Remove the spines you can see with tweezers.
- Leave the wound uncovered and clean.
- Take paracetamol or ibuprofen for the pain.
Spines you cannot remove, pain or swelling that is getting worse after the first days, or a wound that is not healing need to be seen in person.
Other sea creature stings
The same first aid works for most stings at the beach, with a few differences:
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| Sea creature | What happens | What to do |
|---|---|---|
| Jellyfish | Intense pain, an itchy rash and raised lines on the skin | Seawater rinse, remove tentacles, hot water |
| Portuguese man o’ war | Very painful stings with raised lines on the skin | The same first aid; get medical advice |
| Weever fish | Severe pain after treading on a fish buried in the sand | Hot water, as hot as tolerated Weever fish stings |
| Sea urchin | Spines left in the skin, usually of the foot | Hot water, and remove the spines you can see |
| Stingray | A painful puncture wound | In-person care |
How to prevent jellyfish and sea urchin stings
Most stings at the beach can be avoided:
- Look out for beach warning signs and flags, and ask the lifeguards about jellyfish.
- Consider a wetsuit or protective swimwear, especially in spring and summer.
- Wear water shoes or sandals in shallow water and on rocky areas.
- Shuffle or stamp your feet in shallow water to warn sea creatures that you are coming.
- Do not touch or handle jellyfish or other sea creatures that sting.
Which jellyfish sting treatment might the doctor recommend?
Treatment depends on how severe the symptoms are and whether anything is left in the skin. This is the framework the doctors use, in line with NHS guidance.
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| What you have | Likely first step | Suitable for online care? | When in-person care is needed |
|---|---|---|---|
| Pain and a red rash after first aid | Painkillers, and an antihistamine or a mild steroid cream for the itch | Yes | Not usually needed |
| Severe pain that is not going away | Assessment and stronger pain relief | Yes, to assess | If the pain continues despite hot water and painkillers |
| A rash still itchy or raised weeks later | A steroid cream for the itch, and checking the diagnosis | Yes | Not usually needed |
| A sting in the mouth, the throat or near the eye | Assessment | Partly | In-person care |
| Spines left in the skin, or a wound that is not healing | Removal of spines and wound care | Partly | To remove deep spines |
| Breathing difficulty, chest pain, severe swelling or fainting | Emergency treatment | No | Call 112 now |
Still in pain after a sting at the beach? A doctor can tell you in one consultation what to do next.
See available times →Treatment options for jellyfish stings
What you can do yourself
- Soak the sting in water as hot as you can tolerate for at least 30 minutes.
- Take paracetamol or ibuprofen for the pain.
- Ask a pharmacist about an antihistamine or hydrocortisone cream for the itch.
- Keep the area clean, and do not scratch.
Prescription treatment
A prescription is never issued without a consultation. Most stings settle with first aid. For a rash that stays itchy, the doctor may prescribe a steroid cream. If a sting or a spine wound becomes infected, the doctor can prescribe antibiotics. If the doctor prescribes, use the prescription at a pharmacy near you.
What does not help
Urine, ice and cold packs do not help, and the sting should be rinsed with seawater rather than fresh water. Vinegar can make some Mediterranean stings worse.
Special situations
Stings in a tropical country
After a sting in a tropical country, get medical advice promptly, because some tropical species are more dangerous.
A high temperature or a wound that does not heal
After a sting while travelling, a high temperature or a wound that is not healing needs to be checked.
Allergies
If you have had a severe allergic reaction to a sting before, keep your adrenaline auto-injector with you at the beach, and use it and call 112 if a reaction starts.
Beach holidays
Ask the lifeguards which stinging species are about, and keep a pair of tweezers and a plastic card in your beach bag. Other holiday health problems are covered on the travel illnesses page.
Children
Mobi Doctor consultations are for adults aged 18 and over. A child who is unwell needs a paediatrician or a local doctor in person, and emergency signs in a child mean 112.
When a jellyfish sting is treated online, and when you need in-person care
Treated online: pain, itching and rashes after jellyfish stings, small spine wounds from sea urchins, and signs of infection after a sting.
In-person care: stingray stings, stings in the mouth, throat or near the eyes, spines that cannot be removed, severe pain that is not going away, and any emergency sign.
When to get in-person care
Call 112 or go to an emergency department now for:
- difficulty breathing or chest pain
- a fit or seizure
- severe swelling around the sting, or severe bleeding
- vomiting, feeling lightheaded, or loss of consciousness
Get medical advice the same day for:
- severe pain that is not going away
- a sting in the mouth, the throat or near the eyes
- a sting on the face or genitals, or one that covers a large area, such as a whole arm or leg
- a stingray sting, or a sting in a tropical country
- a high temperature, or a wound that is not healing, after a sting
How Mobi Doctor works
- Book a time that suits you: daily 7am–11pm CEST. You can see a doctor over video, usually within 15 minutes. No subscription, and the exact price is shown before you pay.
- Speak to a licensed doctor about the sting: show it on camera after the hot-water soak, and say what stung you and what first aid you used.
- Leave with a plan: what to do, what to take and for how long, and which signs mean you should be seen in person. If the doctor prescribes, use the prescription at a pharmacy near you.
No sign-up needed
Not sure it’s a jellyfish sting? Tick every symptom you have to see each condition page that mentions it. It finds the right page, not a diagnosis: a doctor gives you that on a video call.
Tap the body — an area or a point — to browse symptoms anywhere
Similar symptoms, different condition? Weever fish stings can start the same way. Compare them, or look up any other symptom in the full symptom checker.
Frequently asked questions about jellyfish stings
What is the best first aid for a jellyfish sting, and what helps the pain?
For a jellyfish sting, rinse the area with seawater, lift off any tentacles with tweezers or the edge of a bank card, then soak the area in water as hot as you can tolerate, without scalding, for at least 30 minutes. Take paracetamol or ibuprofen for the pain. Do not use ice, a cold pack or fresh water.
Should I put vinegar on a jellyfish sting?
Not automatically. Vinegar helps with some jellyfish, but research on Mediterranean species found that it makes the stinging cells of the mauve stinger, the jellyfish behind most stings on Mediterranean beaches, fire more. Follow the lifeguards’ advice for the local species.
Does urinating on a jellyfish sting help?
No. Urine does not help a jellyfish sting and can make it worse: it is mostly water of the wrong saltiness, which can trigger any stinging cells still on the skin to fire, and it is not sterile. Rinse with seawater, lift off the tentacles with tweezers or a card, and soak the area in hot water for at least 30 minutes instead; the myth comes from television, not medicine.
What does a jellyfish sting look like?
A jellyfish sting causes intense pain, an itchy rash with red, purple or brown patches, and often raised lines on the skin where the tentacles touched. Severe swelling, vomiting, chest pain or breathing difficulty after a sting needs 112.
Do all jellyfish sting?
Jellyfish sting with cells on their tentacles, but not every sting hurts people: skin is a natural barrier to most. The moon jellyfish, the most common in UK seas, has a very mild sting, while lion’s mane and mauve stinger jellyfish sting painfully and the compass jellyfish has a nasty sting.
Why do jellyfish sting, and how does the venom work?
Jellyfish do not sting on purpose: their tentacles are covered in stinging cells called nematocysts, each with a coiled, venom-loaded thread that fires automatically when it touches skin, a chemical trigger that still works in a dead jellyfish or a torn-off tentacle. The venom attacks nerve and cell membranes, which is why a jellyfish sting burns at once and why rubbing or fresh water, which make more cells fire, make it worse.
Can a dead jellyfish still sting?
Yes. The tentacles of a jellyfish washed up on the beach still hold venom, and stinging cells can fire even when detached, so do not touch stranded jellyfish.
How long does a jellyfish sting last?
Most stings improve within a few hours. The rash from some stings can last weeks, and a scar can remain. See a doctor if the sting is still itchy after a few weeks.
Are there jellyfish in Ireland?
Yes. Five species are native to Irish waters: the moon, compass, blue, barrel and lion’s mane jellyfish, and the lion’s mane is the most serious. The mauve stinger turns up occasionally, and the Portuguese man o’ war only rarely.
What should I do if I step on a sea urchin?
As with a jellyfish sting, soak the foot in water as hot as you can tolerate for at least 30 minutes, and remove the spines you can see with tweezers. Spines you cannot remove, increasing pain or a wound that is not healing need to be seen in person.
When should I see a doctor after a jellyfish sting?
Get medical advice if severe pain is not going away, the sting is in your mouth, throat or near your eyes, you were stung in a tropical country, or you develop a high temperature or a wound that does not heal. Breathing difficulty or chest pain needs 112.
How can I avoid jellyfish stings?
Look out for beach warning signs and flags, consider a wetsuit or protective swimwear, wear water shoes in shallow and rocky areas, and do not touch jellyfish or other sea creatures that sting, including ones washed up on the beach.
Is it a jellyfish sting or something else?
A jellyfish sting causes intense pain where you were stung, an itchy rash that can show red, purple or brown patches, and raised lines on the skin where the tentacles touched. Severe pain after treading on something buried in the sand points to a weever fish, spines left in the foot to a sea urchin, and a painful puncture wound to a stingray. The same first aid works for most beach stings: rinse with seawater, remove tentacles or spines you can see, then hot water.
Can an online doctor treat a jellyfish sting?
Yes, once first aid has been done. A doctor can look at the sting on camera, check for an allergic reaction, infection or spines left in the skin, and recommend treatment for the pain and itch. Severe symptoms need 112.
- Jellyfish and other sea creature stings, NHS, National Health Service (UK), reviewed 19 June 2024.
- Stings, marine creatures, NHS 111 Wales, updated 2 June 2023.
- Jellyfish in Irish coastal waters, HSE Health Protection Surveillance Centre (HPSC), Ireland, 24 July 2026.
- New ICM study warns not all jellyfish stings should be treated with vinegar, Institut de Ciències del Mar (ICM-CSIC), Barcelona, 5 August 2021.
- Jellyfish sting: symptoms and treatment, Cleveland Clinic, reviewed 7 June 2022.
- Jellyfish superstars you can spot on UK shores, Marine Conservation Society (UK), accessed 15 October 2026.
- Identify UK jellyfish, The Wildlife Trusts, accessed 15 October 2026.
- Compass jellyfish, The Wildlife Trusts, accessed 15 October 2026.
- Anaphylaxis, NHS, National Health Service (UK), reviewed 21 June 2023.
This page is for information only and is not a substitute for a medical consultation. Guideline links are provided for transparency; treatment decisions are made with your doctor.
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