Added this bit to https://painimprovement.com/painful-urination-or-bladder/
If you have a painful bladder, or burning and/or frequent urination, (need to urinate often), or have lower abdominal or pelvic pains, or have been diagnosed often with bladder infections only to find out from your doctor a few days or weeks later that it was not a bacterial infection, you may have Interstitial Cystitis.