Editing Small intestine (section)

==Clinical significance==
{{See also|Gastrointestinal disease}}

The small intestine is a complex organ, and as such, there are a very large number of possible conditions that may affect the function of the small bowel. A few of them are listed below, some of which are common, with up to 10% of people being affected at some time in their lives, while others are vanishingly rare.
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* Small intestine obstruction or obstructive disorders
** [[Meconium ileus]]
** Paralytic [[ileus]]
** [[Volvulus]]
** [[Hernia]]
** [[Intussusception (medical disorder)|Intussusception]]
** [[Adhesions]]
** Obstruction from external pressure
** Obstruction by masses in the lumen ([[foreign body|foreign bodies]], [[bezoar]], [[gallstone]]s)
* [[Infectious diseases]]
** [[Giardiasis]]
** [[Ascariasis]]
** [[Tropical sprue]]
** Tapeworm (''[[Diphyllobothrium latum]]'', ''[[Taenia solium]]'', ''[[Hymenolepis nana]]'')
** Hookworm (e.g. ''[[Necator americanus]]'', ''[[Ancylostoma duodenale]]'')
** Nematodes (e.g. ''[[Ascaris lumbricoides]]'')
** Other Protozoa (e.g. ''[[Cryptosporidium parvum]]'', ''[[Cyclospora]]'', ''[[Microsporidia]]'', ''[[Entamoeba histolytica]]'')
** Bacterial infections
*** Enterotoxigenic ''[[Escherichia coli]]''
*** ''[[Salmonella enterica]]''
*** ''[[Campylobacter]]''
*** ''[[Shigella]]''
*** ''[[Yersinia]]''
*** ''[[Clostridioides difficile infection|Clostridioides difficile]]'' (antibiotic-associated colitis, ''[[Pseudomembranous colitis]]'')
*** ''[[Mycobacterium]]'' ([[Mycobacterium avium paratuberculosis]], disseminated ''[[Mycobacterium tuberculosis]]'')
*** [[Whipple's disease]]
*** ''[[Vibrio]]'' ([[cholera]])
*** [[Typhoid|Enteric (typhoid) fever]] (''[[Salmonella enterica]]'' var. typhii) and [[paratyphoid fever]]
*** ''[[Bacillus cereus]]''
*** ''[[Clostridium perfringens]]'' ([[gas gangrene]])
** Viral infections
*** [[Rotavirus]]
*** [[Norovirus]]
*** [[Astrovirus]]
*** [[Adenovirus]]
*** [[Calicivirus]]
* [[Neoplasm]]s (cancers)
** [[Adenocarcinoma]]
** [[Carcinoid]]
** [[Gastrointestinal stromal tumor]] (GIST)
** [[Lymphoma]]
** [[Sarcoma]]
** [[Leiomyoma]]
** Metastatic tumors, especially [[Small cell carcinoma|SCLC]] or [[melanoma]]
** [[Small intestine cancer]]
* Developmental, congenital or genetic conditions
** [[Intestinal atresia|Duodenal (intestinal) atresia]]
** [[Hirschsprung's disease]]
** [[Meckel's diverticulum]]
** [[Pyloric stenosis]]
** [[Pancreas divisum]]
** [[Ectopic pancreas]]
** [[Enteric duplication cyst]]
** [[Situs inversus]]
** [[Cystic fibrosis]]
** Malrotation
** Persistent [[urachus]]
** [[Omphalocele]]
** [[Gastroschisis]]
** [[Disaccharidase]] ([[lactase]]) deficiencies
** Primary [[bile acid malabsorption]]
** [[Gardner syndrome]]
** [[Familial adenomatous polyposis]] syndrome (FAP)
* Other conditions
** [[Crohn's disease]], and the more general [[inflammatory bowel disease]]
** [[Typhlitis]] ([[neutropenic]] [[colitis]] in the [[immunosuppressed]]
** [[Coeliac disease]] (sprue or non-tropical sprue)
** [[Mesenteric ischemia]]
** [[Embolus]] or [[thrombus]] of the [[superior mesenteric artery]] or the [[superior mesenteric vein]]
** [[Arteriovenous malformation]]
** [[Gastric dumping syndrome]]
** [[Irritable bowel syndrome]]
** [[Peptic ulcer|Duodenal (peptic) ulcers]]
** [[Gastrointestinal perforation]]
** [[Hyperthyroidism]]
** [[Diverticulitis]]
** [[Radiation enterocolitis]]
** [[Mesenteric cyst]]s
** [[Peritoneal]] Infection
** [[Sclerosing]] [[retroperitonitis]]
** [[Small intestinal bacterial overgrowth]]
** [[Endometriosis]]
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