A fever from sunburn typically lasts one to two days, though it can persist longer with severe burns. Fever signals that your sunburn has crossed from a surface-level skin injury into a systemic response, meaning your whole body is reacting to the damage. This is sometimes called “sun poisoning,” which isn’t actual poisoning but rather a severe sunburn that triggers symptoms beyond just red, painful skin.
Why Sunburn Can Cause a Fever
A mild sunburn stays local: redness, warmth to the touch, and tenderness. But when UV exposure is intense or prolonged enough, the damage triggers a broader inflammatory response. Your immune system floods the area with inflammatory signals, and some of those signals reach the rest of your body. The result is a fever, often accompanied by chills, headache, nausea, and fatigue.
This tends to happen when large areas of skin are burned or when the burn is deep enough to blister. The more skin surface involved, the stronger the systemic reaction.
Timeline: From Burn to Recovery
Sunburn symptoms don’t appear immediately. Redness and pain usually develop within a few hours of exposure and peak around 24 to 36 hours later. Fever, if it’s going to happen, typically follows a similar timeline, arriving hours after the burn itself and peaking within the first day or two.
For a mild to moderate sunburn, redness and pain generally start fading after about three days. A fever from sun poisoning lasts longer and resolves more slowly. Most people find their fever breaks within 24 to 48 hours, but the accompanying symptoms (fatigue, skin tenderness, and eventually peeling) can stretch out over a week or more. Blistering burns take the longest to heal, sometimes requiring two weeks before the skin fully recovers.
How Sun Poisoning Differs From a Regular Sunburn
Sun poisoning starts the same way as an ordinary sunburn but escalates. Instead of just redness and soreness, the skin develops blisters, swelling, and intense pain. The systemic symptoms, including fever, chills, nausea, and headache, are what set sun poisoning apart. Harvard Health notes that these symptoms last longer and are more severe than what you’d expect from a typical burn.
If your sunburn is limited to pink skin that’s sore to the touch and you feel fine otherwise, you’re unlikely to develop a fever. The fever signals a more serious burn that your body is actively fighting.
Managing Fever and Discomfort at Home
Over-the-counter pain relievers like ibuprofen or acetaminophen help with both fever and pain. Taking one as soon as possible after the burn can reduce the inflammatory response before it fully ramps up. Ibuprofen is particularly useful because it addresses inflammation directly, not just pain.
Hydration matters more than most people realize. A severe sunburn draws fluid toward the damaged skin, and a fever increases fluid loss through sweat. Drink water consistently, not just when you feel thirsty. Cool (not cold) compresses on the burned skin can bring some relief, and staying in a cool environment helps your body regulate its temperature more easily.
Avoid putting ice directly on sunburned skin, and skip any products containing alcohol or heavy fragrances, which can irritate damaged skin further. Loose, soft clothing prevents friction on tender areas.
When a Sunburn Fever Is Serious
Most sunburn fevers are uncomfortable but manageable at home. However, certain signs indicate you need medical attention. A body temperature above 103°F suggests your body may not be able to regulate its heat effectively, which can overlap with heat exhaustion or heat stroke, especially if you were in the sun long enough to burn badly.
Seek immediate care if you experience any of the following alongside your sunburn:
- Confusion or slurred speech, which can signal heat stroke
- Severe chills that won’t stop, even in a warm environment
- Persistent nausea or vomiting, which makes it hard to stay hydrated
- Dizziness or fainting
- Rapid heartbeat that doesn’t calm down with rest and cooling
Children and older adults are more vulnerable to complications from sunburn fever because their bodies regulate temperature less efficiently. A child with a sunburn fever that doesn’t respond to pain relievers within a few hours warrants a call to their pediatrician.
What to Expect as You Heal
Once the fever breaks, you’re past the worst of the systemic response, but your skin still has a long road. Pain and redness gradually fade over three to five days for moderate burns. Peeling usually begins around day three or four as your body sheds the damaged outer layer of skin. Resist the urge to peel it yourself, since pulling skin off prematurely can expose raw, sensitive tissue underneath and increase the risk of infection.
Blistered skin heals more slowly. Leave blisters intact when possible, as they act as a natural bandage protecting the new skin forming beneath. If a blister pops on its own, keep the area clean and loosely covered. A burn severe enough to cause widespread blistering alongside a high fever may need professional wound care to prevent scarring or infection.