Small Intestine - Conditions Affecting The Small Intestine

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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