Working in front of a computer can be very tiresome sometimes and can take a toll on the body. The eyes need their own rest and the fingers over time tend to become flattened at the top. With low terminals to work at the most affected part is the back. The lumber region of the spine takes all the brunt and the constant bending in front of the monitor does it no good.
In order to avoid such pains the chair on which you sit for such long periods of time need to be comfortable with proper and adequate lumber and thoracic support systems in its design. If this is in an office the chairs cannot be easily replaced. In such cases a routine break from the chair in short spans at regular intervals is best. This keeps the circulation intact and doesn’t stress up the back. A quick walk around or a friendly visit to another cubicle goes long way.