[Pseudoscience-is-malarkey (OP)]

My left wrist and the base of my thumb hurt a little when I twist or flex them a certain way.

And please no jokes like "You'll have to masturbate with your right hand".

[Bored chemist]

My left wrist and the base of my thumb hurt a little when I twist or flex them a certain way.

Then don't  twist or flex them that certain way.

[vhfpmr]

My left wrist and the base of my thumb hurt a little when I twist or flex them a certain way.

Then don't  twist or flex them that certain way.

That's your impersonation of an obtuse doctor, is it?
"Doctor, I hit my head on the corner of the kitchen cupboard and now there's a soft mushy depression in my scalp that makes my head spin when I touch it"
"Well don't touch it then."

[Origin]

Ask your doctor what he thinks.

[Bored chemist]

That's your impersonation of an obtuse doctor, is it?

No.
It's my way of pointing out that the OP shouldn't expect medical advice on line to be any good.

In fairness, I think  Origin's way of putting it

Ask your doctor what he thinks.

 was probably better (give or take the fact that some doctors are "she" rather than "he").

[Bored chemist]

"Well don't touch it then."

That would be very sound advice, wouldn't it?