Conditions Affecting The Small Intestine
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.
- Small intestine obstruction or obstructive disorders
- Paralytic ileus
- Volvulus
- Hernia
- Adhesions
- Obstruction from external pressure
- Obstruction by masses in the lumen (foreign bodies, bezoar, gallstones)
- Infectious diseases
- Giardiasis
- Ascariasis
- Tropical sprue
- Tape worm (Diphyllobothrium latum, Taenia Solium, Taenia solium, Hymenolepsis nana)
- Hookworm (e.g. Necator americanus, Ancylostoma duodenale)
- Nematodes (e.g. Ascaris lumbricoides)
- Other Protozoa (e.g. Cryptosporidium parvum, Isopora belli, Cyclospora, Microsporidia, Entamoeba histolytica)
- Bacterial Infections
- Enterotoxigenic E. coli
- Salmonella enterica
- Campylobacter
- Shigella
- Yersinia
- Clostridium difficile (antibiotic-associated colitis, Pseudomembranous Colitis
- Mycobacterium (disseminated Mycobacterium tuberculosis)
- Whipple's Disease
- Vibrio (Cholera
- Enteric (Typhoid) Fever (Salmonella enterica var. typhii) and Paratyphoid fever
- Bacillus cereus
- Clostridium perfringens (Gas Gangrene)
- Viral Infections
- Rotavirus
- Norovirus
- Astrovirus
- Adenovirus
- Calicivirus
- Small bowel bacterial overgrowth syndrome
- Neoplasms (Cancers)
- Adenocarcinoma
- Carcinoid
- Gastrointestinal Stromal Tumor (GIST)
- Lymphoma
- Sarcoma
- Leiomyoma
- metastatic tumors, especially SCLC or Melanoma
- Developmental, Congenital or Genetic Conditions
- 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
- Disachharidase (lactase) deficiencies
- Primary Bile Acid Malsorption
- 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
- Duodenal (Peptic) Ulcers
- Gastrointestinal perforation
- Lymphatic Obstruction due to various causes
- Hyperthyroidism
- Diabetic Neuropathy
- Diverticula
- Radiation Enterocolitis
- Drug Induced Injury
- Diversion Colitis
- Mesenteric cysts
- Peritoneal Infection
- Sclerosing Retroperitonitis
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