You can't catch interstitial cystitis/painful bladder syndrome. Although researchers are not sure what causes IC/PBS, it is not a virus, and no bacteria are present in the urine of people with IC/PBS. Furthermore, taking antibiotics does not affect the symptoms of IC/PBS.
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Honor Society of Nursing (STTI) answered
No, interstitial cystitis is not contagious. Interstitial cystitis, also know as IC, is chronic inflammation of the bladder that leads to an increased urgency to void; pain, pressure and tenderness around the bladder, pelvis, and perineum; pain during intercourse; and in men, pain or discomfort in the penis or scrotum.