Skip directly to search Skip directly to A to Z list Skip directly to navigation Skip directly to page options Skip directly to site content

Sunlight & UV

Sunlight & UV and Health

Intense or prolonged exposure to the sun can lead to:

Skin cancer is the most common cancer in the United States. Melanoma is the most dangerous kind of skin cancer. It is also one of the most common cancers among adolescents and adults under age 40. UV radiation exposure causes most melanomas.

You can take steps to protect yourself and your family from UV exposure. Check out all of CDC’s sun safety tips.

For more information about UV and its health effects, visit CDC’s Radiation and Your Health website.

Stay up-to-date on the current UV index forecast from the National Weather Service.

Read Emma's story


Exposure to UV light from the sun or tanning beds increases your risk of developing melanoma. Read Emma’s story about her melanoma diagnosis.