My left thumb keeps twitching. What could be causing it?

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Could be carpal tunnel syndrome or you might have pulled your bicep muscle or mummy's wrist. See a doctor if it persists. Hopefully it subsides. Try massaging your biceps.

It could be carpal tunnel syndrome. You can see a doctor, or you can try TCM acupuncture.

How long has it been going on for? hope ya better soon