I have had many of the causes of this.. surgery, urologist reaching in the way kidney stoneys come out with a basket, other stones, many infections…and I have had fistula when my gall bladder surgeon messed up and instead of one laparoscopic procedure I was treated to 5 extra ones, and blood transfusions and I became septic…during healing I had a part that was cut and stiched to fix grow to a part and “heal” connecting 2 things that don’t belong…and that is normally how a fistula is caused…if you have some other damage that caused the need for healing and it usually has near damage, on 2 things that don’t belong that then grow together and create a path between things that don’t belong…since your problem is after sex…I don’t believe you have had your vagina and bladder “heal” together, mostly due to location of both of these organs…I would encourage you to see (even if you need to write it down) if it happens more than just after sex…my obgyn has always said pee after sex…as things do get intrudesed to your urethra, that leads to the bladder directly, then to more tubes (long night, can’t spell real word, but I got to have a stent there…so a doc placed tube from kidney to bladder that normally has a string left sticking out so it can be easily (painfully, very much, but super fast), but the tubes go to kidney’s, so peeing after sex, can help wash out some of the vag fluids, or other “things” that don’t belong, including air introduced through the in and out of penetration…so try thY and notes and when its time for your annual…talk to talk to your doc…but if its not happening more and more often, extra things happening, or discomfort, I would say you can wait to see doc, but the more open, honest, and forth coming you are with your docs, the better they can help you and provide better care…the more you share…the better you are – also everyone should save all their films…they come on cd anymore, but the hospital deletes and sometimes they catch stuff much earlier if they have an older imiage to compare too…hope something helps you feel better…

Hi BB. We cannot say for sure if it is a fistula. You will need further diagnostic investigations to confirm this but as you can see from article above there are many possible causes for bubbles in the urine. The question now would be whether this is in air that seems to be coming out of your bladder and if so then the route by which it got there has to be investigated. However, there is also the possibility that this gas is not air but is instead being produced within the bladder. If so then it is possible that you have an infection of sorts and the microbes within the urinary tract may be producing the gas. You can still have a urinary tract infection even if you don’t have the typical symptoms like burning urination and so on. You should consult with your doctor as soon as possible.