Symptoms
The symptoms can include any of the following: Tightness, discomfort, stiffness, soreness or burning in the hands, wrists, fingers, forearms, or elbows Tingling, coldness, or numbness in the hands Feeling a need to massage your hands, wrists, and arms.
Prevention and Recovery
Good work habits which include correct typing technique and posture as well as the right equipment is essential in any prevention setup. Hold the mouse lightly, don't grip it hard or squeeze it, use a light touch on the keyboard, don't hammer those keys. Take lots of regular breaks away from your computer, and be aware of what your body is telling you. Ergonomics Now offers trainings and courses specifically addressing these issues see Prevent Computer Injury
From the BBC - Health
"As many of us spend more and more time in front of computers, the chances of developing repetitive strain injury (RSI) increase. For some people, the pain of RSI is so great that it prevents them from working at all. However, it doesn't develop overnight, so by always remembering that prevention is better than a cure, problems can often be avoided in the first place."
Detail Note on RSI (Repetitive Strain Injuries):