Lupus flare-ups are triggered by the sun, of particular concern to young women of all races. The immune systems of individuals receiving chemotherapy and radiation are weakened and vulnerable to UV exposure. Immune suppression therapy for transplant recipients causes sun sensitivity. Certain medications cause sun sensitivity - check with your doctor or pharmacist. Many people are allergic to the sun, causing painful rashes and blisters.
Sunburn is the most frequent injury reported by travelers.