text: <unk>  <unk> , SRU), is a disorder of the rectum and anal canal, caused by straining and increased pressure during defecation. This increased pressure causes the anterior portion of the<unk>  lining to be forced into the anal canal (an internal<unk>  intussusception). The lining of the rectum is repeatedly damaged by this friction, resulting in<unk> ation.<unk>  can therefore considered to be a consequence of internal intussusception (a sub type of<unk>  prolapse), which can be demonstrated in 94% of cases. It may be asymptomatic, but it can cause<unk>  pain,<unk>  bleeding,<unk>  malodor, incomplete evacuation and obstructed defecation<unk>  outlet obstruction).
option_0: Solitary rectal ulcer syndrome
option_1: Perianal abscess
option_2: Anal fistula
option_3: Anal fissure
option_4: Pseudomembranous colitis
option_5: Anal abscess
option_6: Ischemic colitis
option_7: Chemical colitis