Intuos is not that much different from the pencil/pen we use.(which we are using for a long time)
When you are working with the Tablet, Always consider the desktop arrangement the top priority.
The relationship between your monitor and drawing tablet is very critical.
keep your keyboard, track ball (or mouse), and drawing tablet as close to each other as possible to avoid large arm movements or reaching.
Sitting posture along with the table positioning can put a lot pressure when you are drawing.So fix that thing when you are working digitally.
Use only a small portion of the drawing tablet(if you have a large Intuos) as the "active" area as this will allow you to use your fingers instead of your wrist to cover a large area on the monitor. Limiting arm and wrist movement will prevent conditions like you mentined.
Get the good worksation mount that will help with the ergonomics.
And see these links which will guide you
http://www.ncsu.edu/ehs/www99/right/...ergonomic.html
http://ergo.human.cornell.edu/DEA651...rgo12tips.html
http://ergo.human.cornell.edu/ergoguide.html
Exercises and physio-therapy can improve these condition
