Normal causes: of bubbles in urine include dehydrated concentrated urine and rapid/forceful urination (from holding too long) from any position! Abnormal causes include the protein in the urine you suggest and can come from protein drinks/supplements, high protein meal, or kidney dysfunction. Bacteria from an infection can produce a gas making bubbles. Rare instances can be watched; if recurrent, seek eval
Answered 8/18/2017
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