You've just described "Finkelstein's Test".
Wiki Entry Here
Technically, no - it's an indication that you are suffering from DeQuervain's tenosynovitis. This is anatomically different from Carpal Tunnel Syndrome.
I'm on HGH, and it hit me in one wrist as well. But I think mine was caused by muscle cramping of the forearm, which sprained the thumb tendon that lies within that sheath.
But now that I see your post, I wonder if maybe not...
EDIT: Duh. I'm getting Active Release (ART) performed on it, which is helping - but what just kills me is any intensive forearm work.