Sun Poisoning Symptoms: What They Are and When to Worry

You spent the afternoon outside, and now your skin is red, blistering, and burning, and you feel weirdly sick, with a headache, chills, or nausea you can't explain. You might be wondering if you have something more serious than a regular sunburn. What you're describing is often called sun poisoning, and the good news is that it's almost always treatable at home, though a few symptoms do mean you should call a doctor.

Here's the reassuring part: "sun poisoning" isn't actually poison, and it doesn't mean you've been permanently harmed. It's a catch-all term for two different reactions to the sun, and once you know which one you're dealing with, the right care is usually straightforward.

What is sun poisoning?

"Sun poisoning" is a lay term, not a medical diagnosis, and nothing is actually poisoning you. It usually refers to one of two things: a severe sunburn that comes with whole-body (systemic) symptoms, or an immune reaction to the sun called polymorphous light eruption (PMLE), sometimes called sun allergy or a sun poisoning rash.

Severe sunburn happens after prolonged, unprotected exposure to the sun's UV rays. PMLE, by contrast, is your immune system reacting to UV light, not damage from the burn itself. Both feel alarming, but they are different problems with slightly different care.

Sun poisoning symptoms to watch for

The most common search question is simply: what does sun poisoning feel like? Beyond the redness of an ordinary sunburn, sun poisoning involves skin that is painful, inflamed, and hot to the touch, often with blisters, plus symptoms that affect the rest of your body.

Typical sun poisoning symptoms include:

• Painful, intensely red skin that feels hot to the touch
• Blistering or peeling over the burned area
• Headache, fever, or chills
• Nausea, dizziness, or feeling faint
• Dehydration, because a bad burn pulls fluid away from the rest of your body
• An itchy or burning rash with tiny bumps, raised patches, or small blisters (the PMLE form)

Sun poisoning rash vs. sunburn: how to tell the difference

A regular sunburn is red, warm, and tender, and it follows the exact pattern of where the sun hit you. A sun poisoning rash from PMLE looks different: it shows up as clusters of itchy bumps, raised areas, or blisters, and itching is often the first or only symptom.

Timing is a helpful clue. A PMLE rash usually appears 30 minutes to several hours after sun exposure and tends to break out on skin that's covered all winter but newly exposed in summer, such as the upper chest, the front of the neck, and the arms, while sparing the face and hands that get year-round sun. PMLE most often affects people between ages 20 and 40 and is about four times more common in women than men, especially in those who only get intermittent sun exposure.

How long does sun poisoning last?

For PMLE, the rash and symptoms typically ease within about 2 to 3 days, and the rash usually clears on its own within roughly 10 days, even without treatment, as long as you stay out of strong sun.

A severe sunburn follows the usual burn timeline: the worst pain peaks in the first day or two, then the skin gradually heals and may peel over the following week. Systemic symptoms like fever, nausea, and dehydration should improve as you rest, cool down, and rehydrate. If they get worse instead of better, that's a signal to seek care.

How to treat sun poisoning at home

For the burn and discomfort, dermatologists at the American Academy of Dermatology recommend gentle, cooling care. The goal is to soothe the skin, prevent dehydration, and protect blisters while your body heals.

General home care steps:

• Take frequent cool (not cold) baths or showers, then gently pat your skin dry
• Apply a moisturizer with aloe vera or soy to soothe the skin while it's still damp
• Drink extra water to replace fluids and prevent dehydration
• Do not pop blisters; intact blisters protect against infection and help healing
• Stay out of the sun and cover up until your skin recovers
• For an itchy PMLE rash, cool compresses and staying out of the sun help while it resolves

When to see a doctor

Most sun poisoning resolves at home, but some symptoms need medical attention. Mayo Clinic advises seeking immediate care for a sunburn accompanied by a fever over 103°F (39.4°C) with vomiting, or for confusion, eye pain or vision changes, or signs of skin infection such as spreading redness, warmth, pus, or red streaks.

Also seek help if you have widespread, severe blistering, signs of serious dehydration (intense thirst, very little urination, lightheadedness), or symptoms that keep getting worse. If you get a sun-triggered rash every spring or summer, a clinician can confirm whether it's PMLE and help you build a prevention plan. A telehealth visit, including a tool like Nolla, can be a convenient first step when you're not sure whether your symptoms warrant in-person care.