Sun poisoning feels like a sunburn that has gone wrong. The key difference is that a regular sunburn stays on the surface of your skin, while sun poisoning triggers symptoms throughout your whole body: fever, chills, nausea, headache, and dizziness on top of the painful, reddened skin. If you’re feeling sick after sun exposure, not just sore, that’s the clearest sign you’re dealing with something more serious than an ordinary burn.
Sunburn vs. Sun Poisoning Symptoms
A standard sunburn causes redness, mild swelling, tenderness, and skin that feels warm to the touch. These symptoms typically peak within a day or two and then gradually fade. Sun poisoning shares all of those skin symptoms but adds a second layer of problems that go deeper than the skin itself.
The hallmark signs of sun poisoning include:
- Blisters on the burned skin, which indicate a second-degree burn
- Fever and chills, or feeling extremely cold and shivering despite being warm
- Nausea and vomiting
- Headache
- Dizziness or lightheadedness
- Rapid heartbeat
- Severe pain rather than mild tenderness
- Fatigue and general weakness
Think of it this way: if you feel like you have the flu after a day in the sun, that’s the body’s systemic reaction that separates sun poisoning from a simple burn. The skin damage is bad enough to trigger a broader inflammatory response, and your body starts losing fluids and electrolytes through the damaged skin, which compounds the problem.
What Sun Poisoning Looks Like on Your Skin
The skin itself often looks distinctly different from a regular sunburn. Instead of uniform redness, sun poisoning can produce bright red, oozing skin with blisters. The redness tends to be more intense and the swelling more pronounced. In some cases you’ll see dense clusters of small bumps packed closely together, raised rough patches, or a rash that looks different from the flat redness of a typical burn.
Some people experience a specific type of sun reaction called polymorphous light eruption, which produces itchy, inflamed bumps and small blisters. This rash tends to show up on areas that were covered during winter but exposed in summer, like the upper chest, front of the neck, and arms. It’s essentially an abnormal immune reaction to UV light, and it looks more like an allergic rash than a burn.
Another, rarer reaction is solar urticaria, which produces raised red or white hives within minutes of sun exposure. These hives often have sharp lines where clothing blocked the light. Solar urticaria typically fades within hours, which distinguishes it from sun poisoning blisters that persist for days.
How Quickly Symptoms Appear
Sun poisoning symptoms generally follow a progression. It starts with a red rash, then escalates to blisters, severe pain, increased swelling, and fever. The skin symptoms often appear within hours of exposure, but the systemic symptoms (nausea, headache, chills) can take longer to develop as dehydration sets in and the body’s inflammatory response ramps up. Unlike a mild sunburn that resolves in a couple of days, sun poisoning symptoms last longer and can worsen before they improve.
Why Some People Are More Vulnerable
Fair skin is an obvious risk factor, but medications play a surprisingly large role. Many common drugs make your skin dramatically more sensitive to UV light. These include certain antibiotics (especially tetracycline-type drugs), common pain relievers like ibuprofen and naproxen, some cholesterol-lowering medications, blood pressure pills that contain diuretics, birth control pills, acne treatments containing retinoids, and even over-the-counter antihistamines. Skincare products containing alpha-hydroxy acids also increase sun sensitivity.
If you’re taking any of these and you burn far more easily than expected, or develop a severe reaction from what seemed like modest sun exposure, the medication is likely amplifying the UV damage. This doesn’t mean you need to stop your medication, but it does mean your threshold for sun poisoning is lower than you’d expect.
How to Care for Sun Poisoning at Home
Hydration is the top priority. Drink extra water throughout the day, because your body is losing fluid through the damaged skin. Cool the burned areas with a clean towel dampened with cool tap water for about 10 minutes, several times a day. A cool bath with about two ounces of baking soda added to the tub can also help. Aloe vera gel or calamine lotion soothes the skin, and refrigerating these products before applying them adds extra relief. Avoid anything containing alcohol, which dries out already damaged skin.
For pain and inflammation, a nonprescription 1% hydrocortisone cream applied to the affected area three times a day for up to three days can reduce swelling and discomfort. Leave blisters intact if possible. They’re protecting the raw skin underneath, and popping them increases your risk of infection.
Signs That Need Medical Attention
Blisters combined with any of the systemic symptoms are a signal to get medical help. Specifically, watch for bright red or oozing skin, severe pain that isn’t improving, fever, uncontrollable shivering, persistent headache, or repeated vomiting. These signs suggest your body is struggling to manage the damage on its own, and dehydration or skin infection may be setting in. A rapid heartbeat or feeling faint when you stand up are signs of significant fluid loss that may need more than water and rest to correct.
Skin infection is one of the more serious complications. If the burned area starts looking worse after a day or two rather than better, develops increasing redness spreading outward, or begins oozing cloudy or yellowish fluid, bacteria may have entered through the broken skin.