I have had bubbles and foamy urine. I went to see a urologist a cpuple of days ago. Took a blood and urine exam and he did a quick dipstick test and found nothing alarming in my urine. Getting a sonogram in my urine and getting the results back on my tests. He also did a quick exam on my kidneys where he kncoks them on my back and felt no pain at all. I also took a catscan a few months ago and showed no damage or alteration whatsoever in my kidneys bladder or liver. The docotor said it might be excess protein in the urine or crystals in the urine as well. Wish me luck!