Medicines for Jellyfish and sea creature stings

What it is

Stings from jellyfish and other sea creatures are common, particularly when swimming or paddling in the sea, and are usually painful but minor. A range of sea creatures can sting or cause injury, including jellyfish, weever fish (which have venomous spines and are often stepped on in shallow water), sea urchins, and others; in UK waters, most stings are from jellyfish or weever fish and are not dangerous, though they can be very painful. The symptoms of a sting depend on the creature but commonly include: immediate pain, which can be intense; redness, swelling, and marks or a rash where the sting occurred (jellyfish stings may leave a line or pattern of raised marks); itching; and, for injuries like weever fish or sea urchin spines, pain and sometimes a spine left in the skin. Most stings cause only a local reaction that settles over hours to a few days with simple first aid. However, some stings can cause more significant reactions, and it is important to be aware of warning signs that need medical attention: a severe allergic reaction (anaphylaxis), which is a medical emergency; more severe or widespread symptoms; stings to sensitive areas (such as the eyes, mouth, or a large area); stings from more dangerous creatures (relevant in some parts of the world, where certain jellyfish and other marine animals can cause serious or life-threatening effects); signs of infection developing later; or a spine or sting embedded in the skin that needs removing. First aid for common stings involves getting out of the water, removing any tentacles or spines carefully, and appropriate treatment (which differs for jellyfish versus weever fish — for example, heat for weever fish stings), along with pain relief. The key messages are that most jellyfish and sea creature stings in UK waters are painful but minor and settle with first aid, that certain warning signs (such as a severe allergic reaction, or severe symptoms) need urgent care, and that being aware of local marine hazards when abroad is important.

How it is treated

Most jellyfish and sea creature stings are managed with simple first aid, which settles the pain and helps the sting heal, while recognising the warning signs that need medical care. The first aid depends on the type of sting, but general steps include getting the person out of the water and reassuring them, and then treating the specific sting appropriately. For a jellyfish sting: rinse the area with seawater (not fresh water, which can worsen some stings), carefully remove any remaining tentacles (for example using tweezers or the edge of a card, and avoiding touching them with bare hands), and soak the area in warm water (as hot as can be comfortably tolerated) or apply a heat pack, as heat can help with the pain; avoid rubbing the area, and some traditionally suggested remedies (such as urine) are not recommended. For a weever fish sting (common when stepping on one in shallow water): the mainstay is to soak the affected area (usually the foot) in water as hot as can be comfortably tolerated (being careful not to scald) for a prolonged period, as the venom is affected by heat and this significantly relieves the pain, and to remove any visible spines. For sea urchin or other spines, carefully removing spines and cleaning the area is important, and embedded spines may need medical removal. In all cases, taking simple pain relief, cleaning the area, and watching for infection help. It is important to seek medical help for warning signs: a severe allergic reaction (difficulty breathing, swelling of the face or throat, feeling faint — call emergency services and use an adrenaline auto-injector if available, as this is anaphylaxis); severe, spreading, or worsening symptoms; stings to the eyes, mouth, or a large area; a spine or sting that cannot be removed or is embedded; signs of infection developing (increasing pain, redness, swelling, pus, or feeling unwell); or stings from potentially dangerous creatures (particularly relevant abroad, where local advice and emergency care may be needed for certain marine stings). When travelling, being aware of local marine hazards and any specific first-aid advice is worthwhile. The reassuring messages are that most stings in UK waters are painful but minor and settle with appropriate first aid (including heat for jellyfish and weever fish stings), that simple measures relieve the pain, and that certain warning signs — especially a severe allergic reaction — need urgent care.