What Is It?
Sunburn is skin damage caused by too much ultraviolet, or UV, radiation from the sun or artificial UV sources such as tanning beds or sunlamps. It usually causes redness, warmth, tenderness, discomfort, and sometimes peeling or blistering.
Although it may look like simple redness, sunburn is a form of radiation burn affecting the skin. Most mild sunburn is not serious and improves within a few days, but it is still a sign that the skin has been injured.
Repeated sunburn increases the risk of premature skin ageing, dark spots, and skin cancer later in life. Sunburn may also be harder to notice on darker skin, but UV damage can still occur. Pain, heat, tenderness, tightness, or peeling may be clues.
Sunburn is usually considered when redness, soreness, heat, or tenderness appears on exposed skin after UV exposure. It often develops within a few hours, may feel worse after 12 to 24 hours, and mild cases may improve within 3 to 5 days, although peeling can last longer. Other conditions can look similar, including heat rash, allergic skin reactions, irritant dermatitis, photosensitivity reactions, and burns from other causes.
Why Sunburn Is So Common
Sunburn is common because UV rays can damage the skin even when the weather does not feel very hot. People may get sunburn during outdoor sports, beach activities, hiking, driving, school activities, gardening, or working outdoors.
It can also happen on cloudy days because UV rays can still pass through clouds. People often search for sunburn because the skin may look red, feel painful, become itchy, or start peeling later, making them wonder whether it is a mild burn or something more serious.
What Causes It?
Sunburn happens when UV radiation damages skin cells. The body responds with inflammation, which causes redness, warmth, pain, and sensitivity.
Common Causes and Risk Factors
Too much sun exposure
Staying outdoors too long, especially between late morning and mid-afternoon, increases UV exposure and sunburn risk.
Not enough sun protection
Sunburn is more likely when skin is not protected with shade, clothing, hats, sunglasses, or suitable sunscreen.
Skin tone and sensitivity
People with lighter skin may burn more easily, but anyone can get sunburn, including people with darker skin tones. On darker skin, sunburn may be less visibly red but can still cause pain, heat, tenderness, or peeling.
Reflective surfaces
Water, sand, concrete, and glass can reflect UV rays and increase exposure.
Medicines or skin sensitivity
Some medicines, perfumes, essential oils, or skincare ingredients can make skin react more strongly to sunlight. This may cause a stronger sunburn-like reaction.
Sunburn is different from heat exhaustion or heatstroke. Sunburn affects the skin, while heat illness affects the whole body and may cause dizziness, weakness, severe headache, nausea, confusion, fainting, or very high body temperature. They can happen together after strong sun exposure.
What Should You Do?
If sunburn is mild, the first step is to get out of the sun and cool the skin gently. Drink fluids, avoid further sun exposure, and monitor whether the redness, pain, swelling, or blistering is getting worse.
What to Observe First
Pay attention to:
- How large the sunburn area is
- Whether there are blisters
- Whether pain is mild, moderate, or severe
- Whether the skin is swelling
- Whether there is fever, chills, dizziness, nausea, weakness, severe headache, confusion, or fainting
- Whether sunburn affects a baby under 6 months old, a child under 5 years old, an adult aged 65 years and above, a pregnant woman, or someone with a long-term medical condition
- Whether sunburn happened while using a new medicine, perfume, essential oil, or skincare product
How Is It Usually Managed?
Sunburn is usually managed by cooling the skin, preventing further UV exposure, staying hydrated, and allowing the skin to heal. Loose clothing and avoiding hot showers may help reduce discomfort.
A pharmacist can help assess whether the sunburn appears mild, whether self-care is suitable, or whether medical review is safer. Do not pop blisters, as this can increase infection risk.
Ask a Pharmacist If Unsure
Ask a pharmacist if the sunburn is painful, itchy, peeling, or if you are unsure whether a medicine, perfume, essential oil, or skincare product may have increased sun sensitivity.
Seek advice earlier for babies under 6 months old, children under 5 years old, adults aged 65 years and above, pregnant women, or people with diabetes, weakened immunity, or extensive skin conditions.
When to See a Doctor
Seek medical advice if sunburn is severe, worsening, or linked with:
- Large or painful blisters
- Severe swelling
- Fever, chills, dizziness, nausea, weakness, severe headache, confusion, or fainting
- Very high body temperature
- Signs of dehydration, such as very little urine, dry mouth, extreme thirst, or confusion
- Signs of infection, such as increasing redness, warmth, pus, or worsening pain
- Sunburn over a large area, such as most of the back, chest, or limbs
- Sunburn in a baby under 6 months old
- Symptoms of heat exhaustion or heatstroke
Quick Summary
- Sunburn is UV skin damage and a form of radiation burn.
- Redness and pain may appear within hours and often peak after 12 to 24 hours.
- Mild sunburn often improves within 3 to 5 days, but peeling may last longer.
- First cool the skin, avoid more sun, drink fluids, and monitor for blisters or illness.
- Seek medical advice for severe blistering, dehydration, fever, dizziness, confusion, fainting, very high body temperature, or babies under 6 months old.
FAQ
What is sunburn?
Sunburn is skin damage caused by too much UV radiation from the sun or artificial UV sources such as tanning beds or sunlamps. It commonly causes redness, warmth, pain, and peeling.
Is sunburn serious?
Mild sunburn is usually not serious, but severe sunburn can cause blistering, dehydration, infection risk, and heat-related illness. Repeated sunburn increases long-term skin cancer risk.
Is sunburn contagious?
No. Sunburn is not contagious and cannot spread from person to person.
How long does sunburn last?
Mild sunburn often improves within 3 to 5 days. More severe sunburn, especially with blistering or peeling, may take longer.
Can darker skin get sunburn?
Yes. Darker skin may be less likely to burn visibly, but sunburn and UV damage can still happen. Redness may be harder to see, so pain, heat, tenderness, tightness, or peeling may be clues.
Why does sunburn peel?
Peeling happens because the body sheds damaged skin cells as part of the healing process.
Is sunburn the same as heatstroke?
No. Sunburn is skin damage from UV radiation. Heatstroke is a dangerous whole-body heat illness that can cause confusion, fainting, very high body temperature, and needs urgent medical help.
When should I see a doctor for sunburn?
See a doctor if sunburn causes severe pain, large blisters, fever, chills, dizziness, confusion, fainting, dehydration, signs of infection, very high body temperature, or affects a baby under 6 months old.