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Sunburn: Causes, Symptoms, Treatment, and Prevention | Easy Guide

Oghenefejiro Okifo | MD

Medically reviewed by Oghenefejiro Okifo | MD, Harvard Medical School | Henry Ford Hospital - Detroit, MI on January 18th, 2024.

Key Takeaways

  • Sunburn results from UV radiation damaging skin cell DNA, triggering inflammation that appears 4-6 hours after exposure and peaks at 24-48 hours—by the time you notice redness, the damage is already done.

  • First-degree burns cause redness and pain lasting 3-5 days; second-degree burns with blistering indicate deeper damage requiring medical evaluation for infection risk and potential scarring.

  • Five or more blistering sunburns before age 20 doubles lifetime melanoma risk; even non-blistering burns contribute to cumulative DNA damage that increases skin cancer probability over decades.

  • Treatment focuses on symptom relief: cool compresses, aloe vera, NSAIDs for pain and inflammation, and aggressive hydration since sunburn draws fluid to the skin surface and can cause mild dehydration.

  • SPF 30 blocks 97% of UVB rays, SPF 50 blocks 98%—the difference is minimal, but reapplication every 2 hours and after swimming/sweating matters far more than higher SPF numbers for actual protection.

Sunburn is a common problem caused by too much exposure to the sun's harmful ultraviolet (UV) rays. Despite warnings about sun damage, many people still get sunburned each year. Sunburn can lead to early wrinkling, age spots, and an increased risk of skin cancer. In this guide, we'll cover the causes, symptoms, treatment, and prevention of sunburn in easy-to-understand terms.

What Causes Sunburn?

Sunburn is caused by exposure to the sun's UV rays, specifically UVA and UVB rays. These rays penetrate the skin and can cause damage to the DNA in skin cells. The amount of time it takes to get a sunburn depends on your skin type, the sun's intensity, and how long you're exposed to the sun.

Sunburn Symptoms

The most common symptoms of sunburn include:

  • Red, painful skin

  • Swelling

  • Blisters (in severe cases)

  • Flu-like symptoms (fever, chills, nausea, headache, weakness)

  • Peeling and itching skin (a few days after the burn)

Sunburn: Causes, Symptoms, Treatment, and Prevention | Easy Guide

Sunburn Treatment

If you get a sunburn, there are several things you can do to find relief:

  • Apply cold compresses or take a cool bath to soothe the skin

  • Use creams or gels containing menthol, camphor, or aloe vera

  • Take over-the-counter pain relievers like ibuprofen or naproxen

  • Stay hydrated by drinking plenty of water and other fluids

  • Avoid further sun exposure until the burn heals

If you have a severe sunburn with blisters covering a large area of your body, a high fever, or signs of dehydration, contact your doctor.

Preventing Sunburn

The best way to deal with sunburn is to prevent it from happening in the first place. Here are some tips for protecting your skin from the sun:

  • Avoid sun exposure between 10 a.m. and 4 p.m. when the sun's rays are strongest

  • Wear protective clothing like a broad-brimmed hat, long-sleeved shirt, pants, and UV-blocking sunglasses

  • Apply broad-spectrum sunscreen with an SPF of at least 30 to all exposed skin, and reapply every 2 hours or after swimming or sweating heavily

  • Talk to your doctor about any medications you take that may increase your skin's sensitivity to the sun

By following these simple tips, you can enjoy time outdoors while keeping your skin safe from harmful UV rays and reducing your risk of sunburn and skin cancer. Remember, if you notice any unusual changes in your skin, such as a mole that is changing, growing, or bleeding, contact your doctor right away, as this may be a sign of skin cancer.

For more information on sun safety and skin protection, visit the CDC's sun safety page or the American Academy of Dermatology's sun protection guide.

The Bottom Line

Prevention through sunscreen, protective clothing, and avoiding peak UV hours (10am-4pm) is far more effective than treating sunburn after it occurs. If you have severe sunburn with extensive blistering, fever, or signs of heat exhaustion, Doctronic can help assess whether medical treatment is needed.

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