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What you have is called trigger finger or trigger thumb, it is from inflammation of the tendon sheath and that causes a small nodule on the sheath which sometimes cacthes on the nodule
This is not something that is affected by diet. it is caused by overuse and wear and tear. It may be treated with drugs like Motrin , and if that doesn't help then in an injection into your tendon sheath, and the last option is surgery to release the pulley it catches on
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