tenesmus causes
A separate condition called vesical tenesmus is related to the urinary bladder. It is experienced as feelings of being unable to completely empty the bladder, despite possibly there being no urine present. Contents of this article: Causes and risk factors. Possible causes of tenesmus include an inflammation of the colon, colorectal cancer, and irritable bowel syndrome. There are several potential reasons why someone would experience rectal tenesmus, the most common being colon inflammation, either from a noninfectious or infectious cause.