Why is my wrist hurting?

My right wrist hurts so bad. i m a rightie. i take notes in my classes. but its not like you have to write so fast....and writing does nt even hurt. only bending does. and i dont hev tingling feeling. i did some excersize by moving my wrist but it makes it worse. and the funny thing is it happened last year too exactly at the same time. what can be wrong with my wrist????