@vlorenzo Welcome to Mayo Clinic Connect! There are a few causes of bubbles in your urine, including dehydration [urine is more concentrated], excessive protein, or force of the expelling of urine. Here is an article from the National Kidney Foundation that may help you:
https://www.kidney.org/news-stories/what-your-urine-says-about-your-kidney-health
How long have you been experiencing bubbles in your urine?
Ginger