blood in urine after masturbation

I'VE MASTURBATED FOUR TIMES THIS WEEK AFTER i HAD A CYSTOSCOPIC BIOPSY. I AM 65 AND HAVE HAD A DROP OF BLOOD IN MY URINE TWICE. IS THIS NORMAL? SHOULD I AVOID MASTURBATING FOR A PERIOD OF TIME?

[Dr. Kokil Mathur]

Hi!
Cystoscopy biopsy can cause some injury to the urethra, and this can cause blood in urine even otherwise. However, post masturbation, due to increased stiffness and turgidity in penis, the urethral injury can worsen. Hence, if you recently had cystoscopy, it would be best to wait a week or two before resuming masturbation. If bleeding persists after that, please consult your treating doctor. Take care!