One of the main places the pain originates from is the upper back/neck. And its leading cause is the desk, or, rather, how you sit at it and for how long. Generally, the longer you sit, the more you’ll slouch, causing your shoulders to roll forwards and chin to poke out. If you have to look down at your screen you will slouch sooner. Over time, this position will produce tightness in your upper shoulders and, eventually, neck pain.