Sunburn pain typically lasts 3 to 7 days, depending on severity. It starts within a few hours of UV exposure, peaks at about 24 hours, and gradually fades from there. A mild burn may stop hurting in 3 days, while a severe or blistering burn can cause discomfort for a week or longer.
The Pain Timeline, Hour by Hour
You won’t feel the worst of a sunburn right away. Pain usually begins a few hours after you’ve been in the sun, even though your skin may already look pink. Over the next several hours, your skin gets progressively redder and more tender, with pain peaking around the 24-hour mark.
That first day and night are the most uncomfortable. After the peak, pain gradually eases over the next 2 to 4 days for a typical first-degree burn (red, hot skin without blisters). Most mild to moderate sunburns start to feel noticeably better after about 3 days. By a week, the burn itself has usually resolved, though peeling and some residual sensitivity can linger.
Why It Hurts So Much
UV radiation doesn’t just turn your skin red. It triggers a cascade of inflammatory chemicals inside your skin cells. Your body releases compounds called prostaglandins, the same pain-signaling molecules involved in headaches and muscle soreness, along with other inflammatory messengers. These chemicals cause blood vessels to dilate (that’s the redness), fluid to leak into surrounding tissue (the swelling), and nerve endings to become hypersensitive.
This is why even light touch, clothing, or a warm shower can feel excruciating on sunburned skin. Your nerves aren’t just responding to damage already done. They’re being actively sensitized by the inflammatory response, which builds over hours and explains why the pain keeps getting worse long after you’ve come inside.
What’s Happening Under the Surface
While the pain and redness are the parts you notice, UV light also damages your skin cells’ DNA. Repairing that damage takes longer than you might expect. The half-life of UV-induced DNA defects is 20 to 30 hours, meaning it takes that long for your cells to fix even half the damage. Research from the University of Queensland found that in skin biopsies taken 72 hours after sun exposure, nearly 25% of the DNA damage detected at the 24-hour mark was still present.
Your skin eliminates most of this damage over a few days, but the repair process is part of why you continue to feel sore and sensitive even after the worst redness has faded.
Mild Burns vs. Blistering Burns
Severity makes a significant difference in how long you’ll be in pain. A mild sunburn, where your skin is red and tender but intact, follows the standard timeline: pain peaks at 24 hours, starts fading by day 3, and resolves within a week.
Blistering sunburns are a different story. Blisters indicate a second-degree burn, and they bring a longer, more complicated recovery. The pain is more intense, lasts longer, and comes with risks that simple redness doesn’t. Severe sunburns can cause dehydration from fluid loss, skin infections if blisters break open, and systemic symptoms like fever, chills, nausea, and headache. This is sometimes called “sun poisoning,” though it’s not actual poisoning. It’s just a term for a sunburn severe enough to make your whole body feel sick. These symptoms last longer and are more severe than a standard burn, and healing can stretch well beyond a week.
Peeling and Hell’s Itch
Just when you think the worst is over, peeling begins. As your body sheds damaged skin cells, the affected area often becomes dry, flaky, and itchy. This typically starts a few days after the initial burn and can last another several days.
Some people experience something far more intense: a deep, throbbing itch known as “hell’s itch.” It usually strikes 1 to 3 days after the burn, most often on the upper back and shoulders. Unlike normal itching, it comes in waves and can be genuinely agonizing. The good news is that it typically subsides within 48 hours. Scratching tends to make it worse, so cool compresses and over-the-counter pain relievers are a better approach.
What Actually Helps With the Pain
Taking an anti-inflammatory pain reliever like ibuprofen as soon as possible after getting burned can help blunt the inflammatory response while it’s still building. This won’t prevent the burn, but it can take the edge off the peak pain. Acetaminophen helps with pain but doesn’t reduce inflammation the way ibuprofen does.
Cool (not cold) baths or compresses provide temporary relief by constricting blood vessels and numbing the area slightly. Moisturizers with aloe vera can soothe dry, tight skin, though they won’t speed healing. Avoid anything with lidocaine or benzocaine on large areas of burned skin, as these can cause irritation of their own. Staying well hydrated matters too, since sunburns draw fluid toward the skin’s surface and can leave you mildly dehydrated.
The most important thing is to protect the burned skin from further sun exposure while it heals. Your skin is already damaged and far more vulnerable to additional UV injury. Loose, soft clothing and shade are your best options until the tenderness is completely gone.