It's called repetative strain injury. It happens when you repeatedly do the same thing over and over and over again. It's a work hazard. You don't need to go to the ER for it.

Just make sure you do exercises and stretches.

Here is a link to how to exercise/stretch your hands.

 

http://www.will-harris.com/yoga/rsi11.html

 

http://www.stretchnow.com.au/exercises/hands.htm

 

Here is a video

 

Another video

 

 

 

"It is good to see ourselves as others see us. Try as we may, we are never
able to know ourselves fully as we are, especially the evil side of us.
This we can do only if we are not angry with our critics but will take in good
heart whatever they might have to say." - Ghandi