Sea nettle sting first aid
Most sea nettle stings in the Chesapeake Bay are painful but not dangerous. They cause a burning, itchy welt that usually calms down over a few hours to a few days. The steps below follow mainstream first-aid guidance for common jellyfish stings in temperate waters like Virginia's.
This page is general information, not medical advice. When in doubt, or for a severe reaction, call your doctor or emergency services.
What to do, step by step
1. Get out of the water
Leave the water calmly so you do not get stung again or have trouble if the pain is strong. Try not to rub the area, since rubbing can trigger more stinging.
2. Rinse with seawater, not fresh water
Rinse the sting with seawater to wash off any tentacle bits. Do not rinse with fresh water and do not pour bottled drinking water on it right away. Fresh water can make undischarged stinging cells fire and make the sting worse.
3. Remove any tentacles safely
If you can see tentacles stuck to the skin, remove them with tweezers or by scraping gently with the edge of a credit card. Do not use your bare fingers, or you may sting your hand.
4. Ease the pain with heat
For most temperate jellyfish stings, heat helps with pain. Soak the area in hot water, or run a hot shower over it, as hot as you can comfortably stand without scalding. Keep it there for about 20 to 45 minutes. Test the water on unstung skin first, and be extra careful with children, whose skin burns more easily.
5. Treat the itch and swelling
Once the pain settles, over-the-counter pain relievers can help with soreness, and antihistamines or hydrocortisone cream can help with itch and swelling. Follow the label, and check with a pharmacist or doctor if you are unsure.
What not to do
A few popular home remedies are myths or can make things worse:
- Urine: Peeing on a sting does not help. This is a myth and can irritate the skin.
- Meat tenderizer, alcohol, and random household products: These are not reliable and some can worsen the reaction. Stick to the steps above.
- Rubbing with sand or a towel: This can press stinging cells into the skin and spread the sting.
- Fresh water and ice applied directly: Fresh water can trigger more stinging. Heat is the better first move for these stings.
A note on vinegar
Vinegar advice is not one-size-fits-all. For some tropical species, like box jellyfish, vinegar is recommended to stop stinging cells. For other species it can actually cause more stinging cells to fire. Because guidance varies by species and region, vinegar is not a clear win for Chesapeake Bay sea nettles. If you are on a tropical trip, follow the local lifeguard and health guidance there, which may specifically recommend vinegar. To learn which jellyfish you are dealing with, see our Chesapeake Bay jellyfish species guide.
When to seek emergency care
Most sea nettle stings can be handled at home. Call emergency services or go to urgent care right away if you or someone with you has:
- Trouble breathing, wheezing, or throat tightness
- Chest pain or a fast, pounding heartbeat
- Signs of a severe allergic reaction, like swelling of the lips, tongue, or face, dizziness, or fainting
- A sting to the eyes, mouth, or face
- A sting over a large area of the body, or in a young child or someone who is elderly or unwell
- Symptoms that keep getting worse instead of better
Stings from a Portuguese man o' war or from tropical box jellyfish can be more serious than a bay sea nettle. If you are in tropical waters, follow local lifeguard and health guidance, which may differ from the steps here.
The best treatment is avoiding the sting
You can lower your chances of getting stung in the first place. Check the daily outlook before you swim on the Virginia jellyfish report, compare spots with the best beaches to avoid jellyfish today page, and read our how to avoid jellyfish tips. For background on the sea nettle forecast itself, see VIMS and the NOAA NCCOS Chesapeake Bay sea nettle forecasts.