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This is a broad question...certain deficiencies could be associated with a sense of weakness but you would need evaluation ...
Myasthenia Gravis is a neuromuscular disease which is autoimmune in nature and may cause muscle weakness ....
You may pursue further evaluation to look into the CAUSE of your symptoms ....
So to see an internal medicine doctor or neurologist may be of help to you
I hope that this is helpful for you
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Thank you and Best Regards!
Anthony Bray MD