I am experiencing severe pain in my left wrist below thumb. There is no swelling. I feel the pain more when i move it in a particular direction or sometimes when it gets jerked. Please note if i don't move to my wrist,  it does not pain at all.  The pain moves near and around the point exactly below my thumb on the wrist. I feel the stiffness in the morning.  What can be the reason for this. Which doctor should i consult.