wrist pain from holding seat bumper (muni)

[minimalist]

I have been riding muni for a little over a year and all of the sudden I’m having a lot of wrist pain from pulling up on the seat bumper during muni rides. I have had several minor occurrences of this pain in my left wrist during the summer but a week ago I went on a muni ride and shortly after the ride I developed significant pain in my left wrist near the pisiform bone (the pea sized bone on the outside of the wrist – straight down from the little finger). It was such a problem that I could not even lift the unicycle with that hand and I experienced a good deal of pain even when turning the steering wheel or lifting a hanger holding a pair of pants. Since I tend to use my left hand more than my right when holding the bumper I thought it might be an overuse issue so I decided to try my next ride (on the same trail) using only my right hand. About half way through that ride (after repeatedly trying a tough hilly section) I noticed the same pain developing in my right wrist (in exactly the same area) and after the ride it gave me just as much pain as I had previously experienced in my left wrist.

Has anyone else experience this issue? I cannot imagine why this is happening all of the sudden. Although I’m fairly new to this trail, I had ridden that trail twice before in the previous week without any issues.

Any thoughts?