Sunburn: Causes, Symptoms, Treatment, and Prevention

What is Sunburn?

Sunburn is a form of radiation burn that affects living tissue, such as skin, which results from an overexposure to ultraviolet (UV) radiation, commonly from the sun. It is characterized by red, painful skin that feels hot to the touch. Sunburn can vary from mild to severe, depending on skin type and the intensity of sun exposure. In severe cases, sunburn can cause blistering, swelling, and even fever or chills.

According to the Mayo Clinic, sunburn is an inflammatory response triggered by UV radiation damaging the skin cells. The skin turns red as blood flow increases to help repair the damage. Sunburn is not just a temporary discomfort; it can cause long-lasting damage to the skin and increase the risk of skin cancer, including melanoma.

Common Causes

Sunburn is primarily caused by overexposure to UV radiation. Here are the most common causes:

• Prolonged sun exposure: Spending too much time in the sun without protection, especially during peak hours (10 a.m. to 4 p.m.), is the most common cause of sunburn.
• Fair skin: People with light skin, freckles, or red or blonde hair are more susceptible to sunburn due to lower levels of melanin, the pigment that provides some protection against UV radiation.
• High-altitude locations: UV radiation increases with altitude, making sunburn more likely in mountainous areas.
• Reflective surfaces: Water, sand, snow, and ice can reflect UV rays, increasing exposure and the risk of sunburn.
• Tanning beds: Artificial sources of UV radiation, such as tanning beds, can cause sunburn and increase the risk of skin cancer.
• Certain medications: Some medications, like antibiotics (e.g., doxycycline), nonsteroidal anti-inflammatory drugs (NSAIDs), and retinoids, can increase sensitivity to the sun.
• Chemical exposure: Certain chemicals, such as those found in perfumes, cosmetics, and some sunscreens, can make the skin more sensitive to UV radiation.
• Medical conditions: Conditions like lupus or porphyria can increase sensitivity to sunlight, making sunburn more likely.
• Previous sunburn: Having a history of sunburn increases the risk of future sunburns and skin damage.
• Geographic location: Areas closer to the equator receive more direct sunlight, increasing the risk of sunburn.

Associated Symptoms

Sunburn symptoms can range from mild to severe and typically appear within a few hours after sun exposure. Common symptoms include:

• Red or pink skin: The skin may feel warm or hot to the touch.
• Pain or tenderness: The affected area may be painful, especially when touched.
• Swelling: Mild to moderate swelling can occur in the sunburned area.
• Blisters: In severe cases, small fluid-filled blisters may form, which can eventually break and peel.
• Itching or tingling: The skin may feel itchy or tingly as it begins to heal.
• Peeling skin: After a few days, the damaged skin may start to peel as the body sheds the damaged cells.
• Fever or chills: Severe sunburn can cause systemic symptoms like fever, chills, or fatigue.
• Headache or nausea: These symptoms can occur with severe sunburn and may indicate heat exhaustion or dehydration.
• Dizziness or confusion: These are signs of heatstroke and require immediate medical attention.

Symptoms usually peak around 24 hours after exposure and can take several days to resolve. Peeling skin is a sign that the body is healing, but it’s important to continue protecting the skin during this time.

When to See a Doctor

Most sunburns can be treated at home, but there are situations where medical attention is necessary. Seek medical help if you experience any of the following:

• Severe blistering: Large blisters covering a significant portion of the body.
• High fever: A fever over 101°F (38.3°C) or chills.
• Severe pain: Pain that is not relieved by over-the-counter pain medications.
• Signs of infection: Increased pain, swelling, warmth, or pus in the blistered areas.
• Dehydration: Symptoms include dry mouth, thirst, reduced urination, dizziness, or fatigue.
• Headache or confusion: These could be signs of heatstroke, a medical emergency.
• Sunburn covering a large area: If a large portion of the body is affected, especially in children or infants.
• Eye pain or vision changes: If you experience pain in the eyes or changes in vision after sun exposure, it could indicate sunburn of the eyes (photokeratitis).

If you are unsure whether your symptoms require medical attention, it’s always best to err on the side of caution and consult a healthcare provider.

Diagnosis

Sunburn is typically diagnosed based on a physical examination and a history of recent sun exposure. In most cases, no special tests are needed. However, if there are signs of infection or other complications, your doctor may recommend additional evaluations.

Physical Examination

During the exam, your doctor will:

• Inspect the affected skin for redness, blistering, or peeling.
• Check for signs of infection, such as pus, increased pain, or warmth.
• Assess the extent of the sunburn and whether it covers a large area of the body.
• Ask about symptoms like fever, chills, headache, or dizziness.

Additional Tests (if needed)

In rare cases, your doctor may order tests to rule out complications, such as:

• Blood tests: To check for signs of infection or dehydration.
• Skin culture: If there is concern about a bacterial infection in blistered or open areas.
• Eye examination: If you have symptoms of photokeratitis (sunburn of the eyes).

Most sunburns do not require extensive testing, but seeking medical advice is important if you have concerns about complications.

Treatment Options

Treatment for sunburn focuses on relieving symptoms, promoting healing, and preventing complications. Most mild to moderate sunburns can be treated at home, while severe cases may require medical intervention.

Home Treatments

For mild to moderate sunburn, the following home remedies can help:

• Cool compresses: Apply a clean, damp cloth soaked in cool water to the affected area for 10-15 minutes, several times a day.
• Hydration: Drink plenty of water to stay hydrated and help the skin heal.
• Moisturizers: Use aloe vera gel or a gentle, fragrance-free moisturizer to soothe the skin. Avoid products containing alcohol, which can dry out the skin.
• Over-the-counter pain relievers: Nonsteroidal anti-inflammatory drugs (NSAIDs), such as ibuprofen or aspirin, can help reduce pain and inflammation.
• Avoid further sun exposure: Stay indoors or wear protective clothing if you must go outside.
• Do not pop blisters: Blisters protect the underlying skin and help prevent infection. If a blister breaks, clean the area gently with mild soap and water, apply an antibiotic ointment, and cover it with a nonstick bandage.
• Cool baths: Taking a cool (not cold) bath can help soothe the skin. Adding colloidal oatmeal or baking soda to the bath may provide additional relief.

Medical Treatments

For severe sunburn, your doctor may recommend:

• Prescription pain medications: If over-the-counter options are not sufficient.
• Topical steroids: Cream or ointment to reduce inflammation and speed up healing.
• Oral steroids: In rare cases, oral corticosteroids may be prescribed for severe inflammation.
• Antibiotics: If there are signs of bacterial infection in blistered or open areas.
• Intravenous (IV) fluids: For severe dehydration or heat exhaustion.

If you have a severe sunburn, follow your doctor’s instructions carefully and attend any follow-up appointments to monitor healing.

Prevention Tips

Preventing sunburn is essential for protecting your skin and reducing the risk of long-term damage, such as premature aging and skin cancer. Here are some effective prevention strategies:

• Use sunscreen: Apply a broad-spectrum sunscreen with an SPF of at least 30 to all exposed skin, even on cloudy days. Reapply every two hours or more often if swimming or sweating. The American Academy of Dermatology (AAD) recommends using about one ounce (enough to fill a shot glass) to cover the entire body.
• Wear protective clothing: Long-sleeved shirts, pants, and wide-brimmed hats can provide additional protection. Look for clothing with a UPF (Ultraviolet Protection Factor) rating for better sun protection.
• Seek shade: Stay in the shade, especially during peak sun hours (10 a.m. to 4 p.m.), when UV rays are strongest.
• Use sunglasses: Wear sunglasses that block 100% of UVA and UVB rays to protect your eyes from sun damage.
• Avoid tanning beds: Tanning beds emit UV radiation that can cause sunburn and increase the risk of skin cancer.
• Be cautious near reflective surfaces: Water, sand, snow, and ice can reflect UV rays, increasing your exposure.
• Check medications: Ask your doctor or pharmacist if any medications you are taking increase sun sensitivity.
• Protect children: Infants and children are especially vulnerable to sunburn. Keep babies under 6 months out of direct sunlight, and use sunscreen and protective clothing for older children.
• Use lip balm with SPF: Lips can also get sunburned, so use a lip balm with SPF 30 or higher.
• Monitor UV index: Check the UV Index in your area and plan outdoor activities accordingly.

By taking these precautions, you can enjoy the outdoors while minimizing the risk of sunburn and long-term skin damage.

Emergency Warning Signs

Sunburn can sometimes lead to serious complications that require immediate medical attention. Seek emergency care if you or someone else experiences any of the following:

• Severe blistering: Large blisters covering a significant portion of the body, especially if they are painful or show signs of infection (e.g., pus, increased redness, or warmth).
• High fever: A fever over 103°F (39.4°C) or fever accompanied by chills, nausea, or vomiting.
• Signs of dehydration: Extreme thirst, dry mouth, dizziness, confusion, or reduced urination. Dehydration can be life-threatening if not treated promptly.
• Heatstroke symptoms: These include a body temperature above 104°F (40°C), hot and dry skin (no sweating), rapid pulse, throbbing headache, nausea, confusion, or loss of consciousness. Heatstroke is a medical emergency and can be fatal if not treated immediately.
• Severe pain: Pain that is not relieved by over-the-counter medications or that interferes with daily activities.
• Vision changes or eye pain: If you experience pain in the eyes, blurred vision, or sensitivity to light after sun exposure, it could indicate sunburn of the eyes (photokeratitis), which requires medical attention.
• Widespread sunburn: If a large area of the body is affected, especially in young children, older adults, or individuals with chronic health conditions.
• Signs of infection: Increased pain, swelling, redness, or pus in the sunburned area, which could indicate a bacterial infection requiring antibiotics.

If you or someone else exhibits any of these emergency warning signs, call 911 or go to the nearest emergency room immediately. Do not wait to see if symptoms improve on their own.

For more information on sunburn and skin health, visit reputable sources like the Centers for Disease Control and Prevention (CDC), National Institutes of Health (NIH), or World Health Organization (WHO).