Generally, we associate injury with movement, overexertion, and other ACTIVE endeavors. But we can get repetitive stress injuries and other very uncomfortable problems and syndromes simply by sitting still (or relatively still) at a desk! Improper movement patterns, over time, lead to many physical ailments such as Carpal Tunnel Syndrome, and a lack of motion leads to muscle atrophy; weak muscles are that much more likely to end up compromised!
Whether it be a screen height issue, a mousing problem, postural issues, and more, unhealthy computer habits can doom a person while healthy habits lead to a more comfortable work day and, by extension, a happier life.
You can make simple adjustments to remedy these issues. Read up on solutions…we can never be too educated!