Does this sound like flexor tenditis to you?
When I click or type, I can see--and feel--movement under the skin on the back of my hand that extends down to my wrist. The pain in the front center and back center of my wrist. As I move it, it becomes more and more tense, but if I pop my wrist by throwing my hand backwards or by gripping it and moving it back, it makes an audible pop and the tension is relieved until I move again. The joints of my fingers are stiff; specifically, the two finger joints of the pinky, the top joint of the ring finger, the central joint of the middle finger and sometimes the knuckle and central joint of the index finger. My thumb's central joint can be popped but causes no pain or tightness.
Pressing my hand flat on a surface and forcing it to remain there causes tightness at the wrist and I can feel what can only be described as a 'spring effect' at the knuckles when I release. Likewise, when opening my hand, I can feel a tightness at the base of my knuckles and the central joint of my middle finger refuses to go straight unless with effort. This is what I describe as 'stiff'. It's not that it won't go so much as it feels like there's a counterpull stopping it from going and putting pressure on my finger joints. There's no swelling.
Is the wrist popping tendons moving?
This is the hand I use to move/click with the mouse.
Note: I tried carpal tunnel testing. Pressing the wrists together with the hand down has no effect except to make my ring finger feel tight (it does anyway). Pressing them together from the front, as if praying, causes my central joints to lift in an A-shape as the hand is lowered, causing an uncomfortable pulling effect and wrist pain. The hand is tight and shaky, not electrical.