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You may be sitting in slumped postures for long periods of time. Your forward head position and incorrect posture cause extreme forces through your neck and upper back.
Sitting for long periods in incorrect positions can cause tightening through the muscles in the neck and jaw. You may clench your teeth when you use the computer.
Carpal tunnel and tennis elbow are problems often reported by people using computers for long periods of time. This is due to poor posture, ergonomics and repetitive movements.
Aside from injuries that you are aware of, you may be sitting for too long or have poor ergonomics at the computer. Sitting with legs crossed over or under also puts excessive strain on the low back.