If you already have a sunburn, you can still take steps to keep it from escalating into sun poisoning, which is essentially a severe sunburn that triggers whole-body symptoms like fever, nausea, and dehydration. The key is acting quickly in the first 24 hours, when inflammation is still building, and protecting your damaged skin from further harm.
What Makes Sun Poisoning Different
A regular sunburn stays at the skin level: redness, warmth, tenderness, maybe some swelling. Sun poisoning pushes past that into systemic territory. You start experiencing symptoms that have nothing to do with your skin surface: headaches, nausea and vomiting, fever and chills, dizziness, fatigue, and a rapid heartbeat. Blisters are the hallmark skin sign, indicating a second-degree burn that can lead to fluid and electrolyte loss, infection, and a longer recovery.
Pain from a sunburn typically starts within a few hours of exposure and peaks at about 24 hours. That means the burn you see right now may not be the worst of it. The window between a painful sunburn and full sun poisoning is that first day, and what you do during it matters.
Get Out of the Sun Immediately
This sounds obvious, but even indirect UV exposure through clouds or reflected off water and concrete continues damaging already-compromised skin. Stay indoors or in full shade for the rest of the day and ideally the following day too. If you must go outside while your skin is still red and inflamed, cover the burned areas with loose clothing rather than relying on sunscreen alone. Damaged skin is far more vulnerable to additional UV injury, and a second round of exposure is one of the fastest paths to sun poisoning.
Hydrate Aggressively
Sunburned skin pulls fluid toward the surface as part of the inflammatory response, which can quietly dehydrate you from the inside. If blisters form, you lose fluid and electrolytes directly through the skin. Drink extra water throughout the day, and if you’re feeling dizzy or nauseated, add an electrolyte drink to replace lost sodium and potassium. Don’t wait until you feel thirsty. Dehydration is one of the main drivers of the systemic symptoms (headache, dizziness, rapid heartbeat) that define sun poisoning.
Cool and Calm the Inflammation
Cool compresses or a cool (not cold) bath can slow the inflammatory cascade in the hours after a burn. Avoid ice directly on the skin, which can add damage to already-injured tissue.
For topical care, apply aloe vera gel or calamine lotion to soothe the skin. For mild to moderate burns, a nonprescription 1% hydrocortisone cream applied three times a day for up to three days can help tamp down inflammation before it spirals. This is one of the more effective over-the-counter options for keeping a moderate burn from worsening. If the burn is severe and home care isn’t cutting it, a doctor can prescribe a stronger corticosteroid cream.
An over-the-counter anti-inflammatory like ibuprofen, taken early, can also help reduce pain and swelling from the inside. Starting it sooner rather than later is more effective, since you’re trying to blunt the inflammatory peak that hits around 24 hours.
Protect the Skin Barrier
Once skin starts peeling or blistering, infection becomes a real risk. Leave blisters intact. They’re acting as a natural bandage, and popping them exposes raw skin to bacteria. Keep the area moisturized continuously. Aloe vera, gentle fragrance-free lotions, or calamine all work. The goal is to prevent cracking and keep the skin barrier as intact as possible while it heals.
Avoid petroleum-based products, which can trap heat in the skin, and skip anything with fragrances, alcohol, or exfoliating acids. Your skin is already in crisis mode, and harsh ingredients will make it worse.
Check Your Medications
Certain common medications dramatically increase your sensitivity to UV light, which means a moderate amount of sun exposure can produce a disproportionately severe burn. If you’re taking any of the following and you’re already sunburned, you may be at higher risk for the burn to worsen:
- Antibiotics like doxycycline, tetracycline, and ciprofloxacin
- Common pain relievers like ibuprofen and naproxen (ironically, the same ones used to treat sunburn)
- Cholesterol medications like simvastatin, atorvastatin, and lovastatin
- Blood pressure pills including thiazide diuretics like hydrochlorothiazide
- Oral contraceptives and estrogens
- Acne treatments containing retinoids like isotretinoin
- Diabetes medications like glipizide and glyburide
- Skincare products with alpha-hydroxy acids (AHAs)
If you’re on any of these, your threshold for sun poisoning is lower than average. Be especially aggressive about staying out of the sun while your burn heals, and watch your symptoms more closely over the next 48 hours.
Warning Signs That Need Medical Attention
Despite your best efforts, some sunburns cross into territory that requires professional care. Watch for blisters covering a large area, fever or chills, nausea and vomiting that don’t resolve, confusion, or bright red oozing skin. These indicate your body’s inflammatory response has gone systemic, and home care alone won’t be enough. A sunburn with blisters plus any combination of fever, severe pain, or vomiting warrants a trip to urgent care or the emergency room.
The 48-Hour Window
Most of what determines whether a sunburn stays a sunburn or becomes sun poisoning happens in the first 24 to 48 hours. Pain and redness peak around the 24-hour mark, so if you’re going to develop systemic symptoms, they’ll typically emerge in that same window. Monitor yourself closely during this period. If you hit the 48-hour mark with stable or improving symptoms, no fever, and no blisters, you’ve likely kept the burn from escalating.
Your skin will still need weeks to fully recover. Continue moisturizing through the peeling phase, protect the area from any sun exposure until it’s completely healed, and keep your fluid intake up. Sunburned skin that peels is shedding its damaged outer layer, and the new skin underneath is even more sensitive to UV than normal.