Many standard office desks and dining tables are built taller than the ideal height for relaxed, neutral typing. When your desk surface sits higher than your naturally bent elbows, you have no choice but to hike your shoulders upward to reach the keyboard and mouse comfortably. Because this elevation is subtle and happens gradually as you settle into work, you may not notice it until your upper trapezius muscles feel tight and rock-hard by mid-afternoon.
Constant shoulder elevation restricts healthy blood flow in the upper back and creates painful myofascial trigger points near the base of the neck. It also encourages shallow, upper-chest breathing instead of relaxed diaphragmatic breathing, which compounds feelings of physical tension and mental fatigue during long work sessions. Over time, chronically elevated shoulders can even irritate the nerves running down toward your arms.
Another hidden culprit behind shoulder shrugging is poorly adjusted chair armrests. If your armrests are set too high, they push your shoulders upward toward your ears; if they are missing or too far apart, your arms hang unsupported and your upper traps work overtime to hold them up while you type.
Check your alignment by sitting back in your chair, letting your arms hang loosely at your sides, and then bending your elbows to ninety degrees. Your keyboard should sit right at that height so your forearms remain roughly parallel to the floor without lifting your shoulders.
If your desk is fixed and too high, raise your chair until your elbows clear the desk edge comfortably and your wrists stay straight. Place a footrest or sturdy box under your feet so your thighs remain supported and your lower back stays relaxed against the backrest. Throughout the day, take a breath and let your shoulder blades drop down into your back pockets whenever you notice tension creeping up.