Editing Fecal incontinence (section)

===Obstructed defecation (incomplete evacuation of stool)===
Normal evacuation of rectal contents is 90{{ndash}}100%.<ref name="ASCRS textbook" /> If there is incomplete evacuation during defecation, residual stool will be left in the rectum and threaten continence once defecation is finished. This is a feature of people with soiling secondary to [[obstructed defecation]].<ref>{{cite journal | vauthors = Rao SS, Ozturk R, Stessman M | title = Investigation of the pathophysiology of fecal seepage | journal = The American Journal of Gastroenterology | volume = 99 | issue = 11 | pages = 2204–2209 | date = November 2004 | pmid = 15555003 | doi = 10.1111/j.1572-0241.2004.40387.x | s2cid = 27454746 }}</ref> Obstructed defecation is often due to [[anismus]] (paradoxical contraction or relaxation failure of the puborectalis).<ref name="ASCRS textbook" />{{rp|38}} Whilst anismus is largely a [[functional disorder]], [[organic disease|organic]] pathologic lesions may mechanically interfere with rectal evacuation. Other causes of incomplete evacuation include non-emptying defects like a [[rectocele]].<!-- <ref name="ASCRS textbook" /> p.37 --> Straining to defecate pushes stool into the rectocele, which acts like a [[diverticulum]] and causes stool sequestration. Once the voluntary attempt to defecate, albeit dysfunctional, is finished, the voluntary muscles relax, and residual rectal contents are then able to descend into the anal canal and cause leaking.<ref name="ASCRS textbook" />{{rp|37}} The various types of prolapse of the posterior compartment (e.g. [[Rectal prolapse#Complete rectal prolapse|external rectal prolapse]], [[Rectal prolapse#Mucosal prolapse|mucosal prolapse]] and [[Rectal prolapse#Internal rectal intussusception|internal rectal intussusception]] & [[Rectal prolapse#Solitary rectal ulcer syndrome and colitis cystica profunda|solitary rectal ulcer syndrome]]) may also cause coexisting [[obstructed defecation]].{{citation needed|date=August 2020}}