Sunburn: Causes, Symptoms, Treatment, and Prevention

Overview

Sunburn is a common skin condition caused by overexposure to ultraviolet (UV) radiation from the sun or artificial sources like tanning beds. It results in red, painful skin that may peel or blister. While often temporary, sunburn increases the risk of long-term skin damage, including premature aging and skin cancer.

Who it affects: Sunburn can affect anyone, but people with fair skin, light hair, and blue or green eyes are at higher risk. Children and individuals who spend significant time outdoors are also more susceptible.

Prevalence: According to the Centers for Disease Control and Prevention (CDC), nearly one-third of U.S. adults report getting sunburned each year. The Skin Cancer Foundation notes that even one blistering sunburn in childhood or adolescence can double the risk of melanoma later in life.

Symptoms

Sunburn symptoms typically appear within a few hours of UV exposure and may worsen over the next 24–72 hours. Common signs include:

• Red or pink skin: The affected area may feel warm or hot to the touch.
• Pain or tenderness: Mild to severe discomfort, especially when touched or exposed to heat.
• Swelling: The skin may become puffy or inflamed.
• Blisters: In severe cases, small or large fluid-filled blisters may form.
• Peeling skin: After a few days, the damaged skin may peel as the body sheds dead cells.
• Itching: The healing process can cause mild to intense itching.
• Systemic symptoms: Severe sunburn (sun poisoning) may cause fever, chills, nausea, headache, or fatigue.

Symptoms usually resolve within 3–7 days, though peeling may continue for up to 10 days.

Causes and Risk Factors

Causes

Sunburn is caused by ultraviolet (UV) radiation, primarily:

• UVA rays: Penetrate deep into the skin, causing long-term damage like wrinkles and age spots.
• UVB rays: Affect the outer layer of skin, causing sunburn and playing a key role in skin cancer development.

UV exposure can come from:

• Direct sunlight (even on cloudy days).
• Reflected light (e.g., from snow, water, or sand).
• Artificial sources like tanning beds or sunlamps.

Risk Factors

Factors that increase the likelihood of sunburn include:

• Skin type: People with Fitzpatrick skin types I or II (fair skin, freckles, light eyes) burn more easily.
• Time of day: UV rays are strongest between 10 a.m. and 4 p.m.
• Geographic location: Higher altitudes and areas near the equator have stronger UV exposure.
• Medications: Certain drugs (e.g., antibiotics like doxycycline, NSAIDs, or retinoids) increase sun sensitivity.
• Lack of sunscreen: Not using or improperly applying sunscreen.
• Previous sunburns: A history of sunburns increases future risk.

Diagnosis

Sunburn is usually diagnosed based on visual inspection and a review of recent sun exposure. In most cases, no tests are needed. However, if symptoms are severe or unusual (e.g., widespread blistering, infection signs), a healthcare provider may:

• Assess the extent of the burn (e.g., percentage of body affected).
• Check for signs of infection (e.g., pus, increased pain, or red streaks).
• Evaluate dehydration or heat exhaustion in severe cases.

For recurrent or atypical sunburns, a dermatologist may recommend a skin biopsy to rule out other conditions like photosensitivity disorders.

Treatment Options

Most sunburns can be treated at home. Treatment focuses on relieving symptoms and promoting healing.

Immediate Care

• Cool the skin: Take a cool (not cold) bath or apply damp compresses.
• Hydrate: Drink plenty of water to prevent dehydration.
• Avoid further sun exposure: Stay indoors until the burn heals.

Medications

• Pain relievers: Over-the-counter NSAIDs (e.g., ibuprofen or aspirin) can reduce pain and inflammation.
• Topical steroids: Hydrocortisone cream (1%) may help reduce inflammation (use as directed).
• Antihistamines: Oral options like diphenhydramine (Benadryl) can relieve itching.

Home Remedies

• Aloe vera: Apply pure aloe vera gel to soothe the skin.
• Moisturizers: Use fragrance-free lotions (e.g., with soy or oatmeal) to hydrate peeling skin.
• Avoid petroleum-based products: These can trap heat and worsen burns.

Severe Sunburn Treatment

For blistering or second-degree burns:

• Do not pop blisters: This increases infection risk. Cover them with a loose, nonstick bandage.
• Prescription treatments: A doctor may prescribe stronger steroids or silver sulfadiazine cream for infected burns.
• IV fluids: In cases of severe dehydration or heatstroke, medical intervention may be needed.

Living with Sunburn

While sunburn heals on its own, proper care can speed recovery and reduce discomfort:

• Wear loose, soft clothing: Avoid tight fabrics that irritate the skin.
• Stay hydrated: Sunburn draws fluid to the skin’s surface, increasing dehydration risk.
• Avoid picking at peeling skin: Let it slough off naturally to prevent scarring.
• Use gentle skincare: Skip exfoliants or harsh soaps until fully healed.
• Monitor for infection: Watch for increased pain, swelling, or pus.

Prevention

Preventing sunburn is critical for skin health. The American Academy of Dermatology (AAD) recommends:

1. Use broad-spectrum sunscreen: Choose SPF 30 or higher, and reapply every 2 hours (or after swimming/sweating).
2. Seek shade: Especially during peak UV hours (10 a.m.–4 p.m.).
3. Wear protective clothing: Long sleeves, hats with wide brims, and UV-blocking sunglasses.
4. Avoid tanning beds: These emit UVA/UVB rays and significantly increase skin cancer risk.
5. Check the UV index: Use apps or weather reports to plan outdoor activities safely.

Note: No sunscreen blocks 100% of UV rays. Combine multiple protection methods for best results.

Complications

Repeated or severe sunburns can lead to long-term complications:

• Premature aging: Wrinkles, sunspots, and leathery skin texture.
• Actinic keratosis: Precancerous skin patches that feel rough or scaly.
• Skin cancer: Including basal cell carcinoma, squamous cell carcinoma, and melanoma.
• Eye damage: Cataracts or macular degeneration from unprotected UV exposure.
• Immune suppression: UV radiation can weaken skin immunity, increasing infection risk.

The World Health Organization (WHO) estimates that up to 90% of skin cancers are linked to UV exposure.

When to Seek Emergency Care

For infants under 1 year old, any sunburn warrants a call to a pediatrician, as their skin is highly vulnerable.

Key Takeaways

• Sunburn is a preventable but common reaction to UV radiation.
• Fair-skinned individuals and children are at highest risk.
• Treatment focuses on cooling the skin, hydration, and pain relief.
• Severe cases may require medical intervention for blisters or infection.
• Long-term UV exposure increases the risk of skin cancer and premature aging.
• Prevention—sunscreen, shade, and protective clothing—is the best strategy.

Sources

• Mayo Clinic
• Centers for Disease Control and Prevention (CDC)
• American Academy of Dermatology (AAD)
• Skin Cancer Foundation
• World Health Organization (WHO)