Headaches: behind the eyes, temples, and forehead
Typical pattern
Screen-related headaches usually sit behind the eyes, at the temples, or across the forehead. They build through the day rather than arriving suddenly, and they ease with breaks more often than they ease with painkillers alone.
The most common drivers are sustained near focus without distance breaks, glare on the screen, and a monitor brightness that is mismatched to the room around it. A bright panel in a dim room, or a dim panel under a hard window, both do the same thing to a tired visual system.
If a headache does not respond to breaks, hydration, or a change of position, that is a reason to get a medical opinion rather than another desk adjustment.
Builds over the day