Tenesmus

Also abdominal urgency and heaviness in the rectum. The urgent desire to evacuate, with difficulty in defecation characterized by heaviness or pressure in the rectum. Tenesmus with stool containing pus and blood is a major sign of dysentery.

Etymology

Chin 裏 lǐ, internal; 急 jí, urgency; 后 hòu, posterior, 重 zhòng, heaviness. Chinese expresses the notion of tenesmus as abdominal (literally internal) urgency and heaviness in the rectum (lit. posterior).