hey razzstone, it's not a diesease but of course in general any "deviation" from a normal life is called disease or illness.but this syndrome is cause due to excessive wrong use of tendons of fingers along with the wrist .it happens due to several causes like excessive pressure on wrist, extension of hand for long period of time, sleep on hand with abnormal position of hand (for long time) etc.it often beginns with numbness n tingling of hand and eventually to loss of sensibility after a certain period of time. in brief it is caused due to mechanical compression of median nerve and can be cured by proper physiotherapy and medicine(OP in need).but as usual no therapy is 100% effective. prevention is better than cure. ASTU!!!