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Can you explain what your symptoms are exactly?
Interstitial cystitis would be the last thing I would think about in your age and with your symptoms. The most likely cause of your symptoms is bladder spasms due to an overactive bladder. The air with in the bladder is most likely due to an infection. It's possible that they may not have detected it on your urine culture. If you continue to have air in the bladder, you need a special CT scan to see if you have a connection between your intestines and your bladder which can cause your symptoms as well as the air. You will need to see a urologist for this testing. Hope this helps and let me know if you have questions.
At your age, it would be extremely unlikely for this to be caused by anything malignant. However, anything is possible. I don't want to scare you but you do need to have a full of valuation to figure out exactly what is going on. The most likely cause of a connection between the intestines in the bladder is a condition such as Crohn's disease of the intestines. This problem can lead to the connection between the bowel and the bladder.
No, I don't see how laxative abuse would cause this. The air in the bladder definitely needs to be further investigated if it continues to occur.
Yes, the CT scan may have detected problem such as Crohn's disease. But it may also missed it because it is not always detectable on CT scan.
This is almost certainly not cancer. The most likely cause would be an infection that they did not detect. The only way to detect persistent air as to repeat a CT scan. But this is really not necessary unless you continue to have persistent urine infections. The only thing you need to have done is a repeat urine culture and to be started on a course of antibiotics to see if this clears up.
AZO does not treat UTIs. It only can sometimes help stop the burning associated with a UTI. If you were definitely diagnosed with a UTI in the past, then your symptoms are definitely due to a UTI.