What's the Problem?
Too much sun exposure causes cancer. It's that simple. Exposed skin is accumulating the sun's rays on hot, cold, clear, cloudy, sunny, snowy days, or even sitting behind a window. In fact, you get 40% to 50% of the sun's rays in the shade.
Ultraviolet radiation (UVA and UVB) is the culprit. UVB is the main cause of skin cancer, while UVA augments its effects. UVA also penetrates deeper, so it is more likely the cause of wrinkles and cataracts.
Runners have an increased risk of skin cancer because they spend so much time outdoors. The Centers for Disease Control and Prevention warns that the incidence of melanoma, a potentially deadly form of ...