As a marine biologist with a focus on marine toxins and their effects on humans, I am well-versed in the various aspects of jellyfish stings. The duration and severity of symptoms following a jellyfish sting can vary greatly depending on several factors, including the species of jellyfish, the individual's sensitivity to the venom, and the promptness and appropriateness of the first aid measures taken.

Immediate Response and Pain
Immediately after a jellyfish sting, there is typically an intense, sharp pain that can be quite distressing. This pain can last for several hours, and in some cases, it may persist for a day or two. The pain is due to the venomous cells, known as cnidocytes, which are located on the tentacles of the jellyfish. When contact is made, these cells can release toxins that cause a range of symptoms, from mild irritation to severe pain.

Skin Reactions
The skin's reaction to a jellyfish sting can manifest in various ways. Often, a raised, red welt develops at the site of the sting, resembling a whiplash mark. These welts can be quite pronounced and may last anywhere from one to two weeks. During this time, the affected area can be tender and may show signs of inflammation.

Itchy Rashes
In addition to the immediate pain and welts, some individuals may experience itchy skin rashes. These rashes can appear one to four weeks after the sting and can be quite bothersome. The itching is a result of the body's immune response to the venom and can be exacerbated by scratching, which can lead to further irritation and potential infection.

Duration of Symptoms
The overall duration of symptoms from a jellyfish sting can range from a few days to several weeks. Mild stings may resolve within a few days, while more severe stings can take longer to heal. The healing process can be influenced by factors such as the depth of the sting, the amount of venom injected, and the individual's overall health.

Treatment
Proper treatment can significantly reduce the duration and severity of symptoms. Immediate first aid measures include rinsing the affected area with saltwater to deactivate any remaining nematocysts (the stinging cells) and removing any visible tentacles. It is important to avoid rubbing the area or using fresh water, as this can cause the nematocysts to discharge further. Over-the-counter pain relievers and antihistamines can help manage pain and itching, respectively. In more severe cases, medical attention may be required, particularly if there are signs of an allergic reaction or if the sting is near a vital area such as the eyes or mouth.

Prevention
While it is impossible to entirely avoid jellyfish, there are steps that can be taken to minimize the risk of stings. These include wearing protective clothing while in the water, avoiding areas where jellyfish are known to be present, and being mindful of jellyfish warnings from local authorities.

In conclusion, the time it takes for a jellyfish sting to go away can vary widely, but with proper care and treatment, most symptoms can be managed effectively. It is essential to be aware of the potential dangers of jellyfish stings and to take appropriate precautions and actions to ensure a swift recovery.

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Jellyfish stings cause immediate, intense pain and burning that can last for several hours. Raised, red welts develop along the site of the sting, which may look like you have been hit with a whip. The welts may last for 1 to 2 weeks, and itchy skin rashes may appear 1 to 4 weeks after the sting.read more >>