tenesmus

‖n. [ NL., fr. Gr. &unr_;, fr. &unr_; to stretch: cf. L. tenesmos. ] (Med.) An urgent and distressing sensation, as if a discharge from the intestines must take place, although none can be effected; -- always referred to the lower extremity of the rectum. [ 1913 Webster ]

Vesical tenesmus, a similar sensation as to the evacuation of urine, referred to the region of the bladder. [ 1913 Webster ]