I developed shoulder pain because my chair armrest was too high so was propping my shoulder up ever so slightly. It took me a while to figure out, and my pain w

I developed shoulder pain because my chair armrest was too high so was propping my shoulder up ever so slightly. It took me a while to figure out, and my pain went away quite quickly once I’d understood the problem. More recently, someone took my chair and moved the head rest by a few centimeters. This pushed my head forward a bit - bam ! Neck pain. You might want to check your chair/posture ( or it might be unrelated).