Respected user, hi I evaluated your query thoroughly. *Relates with occasional shedding of epithelial cells through bladder wall or urethra even in absence of bacteriological infection. *Cause for the same is Non-steroidal anti-inflammatory agents taken as pain killers on OTC basis & creating unseen harm to your different body organs one of which is urinary bladder. Hope this clears your doubts. Thanks for using Health care magic & keeping trust in our medical services. Would like to assist in future for any further health related topics. Regards.