I work a lot with computer and lately my fingers have been aching and i feel pressure when i make a fist, is this carpal tunnel or arthritis coming on?

Possibly: If you have an electrical sensation in your palm or fingers and especially if you feel pressure or pain when making a fist (but still able to make a fist), this may be carpal tunnel. Arthritis is pain of the joints rather than a strictly nerve-type pain.

Carpal Tunnel: Carpal tunnel is typically manifested by numbness and/or tingling in the thumb, index, long, and half of the ring finger. Although aching may be reported, numbness and pins/needles are more common. It can be reproduced by holding your wrist in the bent forward position for well over a minute or may be considered if you can elicit tingling with forcible tapping over the underside of the wrist.

Possible cts: Pain in the wrist and fingers associated with pressure when making a fist can certainly be caused from carpal tunnel syndrome. An evaluation by a hand surgeon who can perform xrays and obtain nerve studies can easily determine the exact cause and treat accordingly.