Position-dependent pain takes a lot of different forms, and the common thread is that a specific posture or activity is the trigger, not general movement. Some people are fine standing but hurt within minutes of sitting, or on a long drive. Occupational research backs up just how common this is: professional drivers report low back pain at some of the highest rates of any occupation studied, driven largely by the posture and vibration of sitting behind the wheel for hours at a time. Others notice it only at the desk, holding a mouse at a certain angle or looking down at a phone for too long, and studies on heavy computer users show meaningfully higher rates of neck and shoulder pain tied to exactly that posture.
Musicians can feel it only while holding a guitar in playing position, and playing-related pain is remarkably common among musicians of every kind, usually centered in the neck. Golfers often feel it at one specific point in the swing rather than everywhere else on the course, and roughly one in three golfers has played through low back pain tied to that exact moment in their mechanics.
Turning the head a certain way, reaching overhead, or stooping into a cramped position can bring on pain that never shows up standing upright. For some people, the position that hurts today is the same position their body was in during an old car accident or a fall, a pattern that has quietly stuck around since the original injury.