Doctor Explains Why She Wears Sunblock Indoors

Most people think of sunscreen as something you apply before heading to the beach or spending an afternoon in the yard. You slather it on, you go outside, you come home and wash it off. But a physician who has spent years studying how ultraviolet radiation damages skin has arrived at a different conclusion: the sunblock should stay on, even when you're sitting at your desk, working from home, or moving through the fluorescent-lit corridors of an office building.

The reasoning is straightforward, if counterintuitive. Ultraviolet radiation doesn't stop at the glass of a window. UVA rays, the longer wavelength variety that penetrates deep into skin and accelerates aging, pass right through standard window panes. They also bounce off surfaces inside your home and workplace. Meanwhile, artificial lighting—the kind that illuminates most indoor spaces—emits its own form of radiation that can contribute to cumulative skin damage over time. The doctor's position reflects a growing consensus among dermatologists that skin cancer risk and photoaging don't follow the simple indoor-outdoor binary most people assume.

This isn't a fringe medical opinion. Increasingly, dermatologists are recommending that their patients adopt year-round sunscreen use as a matter of routine preventive care, not just seasonal protection. The shift represents a recalibration of how the medical profession thinks about UV exposure—not as an occasional hazard to guard against during summer vacations, but as a constant, low-level threat that accumulates across a lifetime. Every hour spent indoors near a window, every day under office lighting, adds to the total dose.

The practical implications are significant. If indoor sunscreen use becomes standard medical advice, it would reshape how people think about their daily routines. A morning application before leaving home would need to become as habitual as brushing teeth. Reapplication during the workday would become necessary. The sunscreen industry would likely see demand shift from seasonal spikes to year-round baseline consumption. More importantly, public health messaging around skin cancer prevention would need to evolve from "protect yourself at the beach" to "protect yourself everywhere, always."

For the physician making this case, the logic is rooted in epidemiology and cellular biology. Skin cancer rates have climbed steadily for decades. Melanoma incidence continues to rise even in populations that don't spend excessive time outdoors. The cumulative exposure model—the idea that every bit of UV radiation, no matter how small or where it occurs, contributes to lifetime risk—explains these trends better than the traditional model of acute sun exposure. Indoor workers are not exempt from this accumulation. They're simply exposed to lower doses over longer periods.

The recommendation also reflects a broader shift in preventive medicine toward addressing risk factors before they manifest as disease. Rather than waiting for precancerous lesions to appear, dermatologists increasingly advocate for blocking the radiation that causes them in the first place. Sunscreen is cheap, accessible, and effective. The barrier to adoption isn't medical—it's behavioral and cultural. People don't yet think of themselves as needing protection while sitting indoors.

Whether this advice will reshape public behavior remains an open question. Habit is powerful. The image of sunscreen as a beach product is deeply embedded in how people think about sun protection. But as more physicians adopt and communicate this perspective, the norm may gradually shift. What once seemed excessive—wearing sunblock to work at an indoor job—could become as routine as any other daily health practice.