What causes the feeling of incomplete bowel movements despite always having the urge to defecate?

Aug 24, 2022 Source: Cainiu Health
Disease description:

Dad constantly feels the urge to go to the bathroom, and he also has difficulty moving around. He says he can't fully empty his bowels and always feels like he needs to go. I don't have time to take him to the hospital right now, so I'd like to know—what could be causing this feeling of incomplete bowel movements along with persistent urge to defecate?

Doctor's answer (1)
Dr. Zhao Haiming
Considered to be caused by factors such as intestinal infection, rectal prolapse, and polyps. Conditions like rectal prolapse and anterior rectal bulging can lead to difficult defecation and a significant sensation of incomplete evacuation after bowel movements, often requiring major surgical intervention. If polyps develop in the intestine and are numerous or large in size, they may obstruct the anal outlet, causing fecal matter to become trapped in the bowel. This can trigger the defecation reflex, resulting in persistent urge to defecate despite inability to pass stool. If there is no improvement after adjusted treatment, it is necessary to visit a hospital for further routine stool tests and colonoscopy.