Rectal prolapse - Wikipedia
Your rectum is the lower part of your colon, where stool forms. If the rectum drops out of its normal place within the body and pushes out of the anal opening, the condition is called rectal prolapse. In the early stages, a prolapse may happen only after a bowel movement. The protruding rectum may then slip back through the anal canal on its own.
All you need to know about rectal prolapse
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Rectal prolapse causes a lump to stick out of your back passage anus and this can become quite painful. Although the lump can pop in and out at first, later on it can stay out all the time, especially when you stand up. This can cause problems with daily activities that involve walking or standing for any length of time.