Editing Malabsorption (section)

==Causes==
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|'''Due to infective agents'''{{citation needed|date=May 2022}}
* [[HIV]] related malabsorption
* Intestinal [[tuberculosis]]
* [[parasitism|Parasites]] ''e.g.'', [[diphyllobothrium]] (fish tape worm)  (B<sub>12</sub> malabsorption), [[giardiasis]] (''Giardia lamblia''), [[hookworm]] (''Ancylostoma duodenale'' [[Strongyloides stercoralis|roundworm]], and ''Necator americanus'')
* [[Traveler's diarrhea]]
* [[Tropical sprue]]
* [[Whipple's disease]]
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|'''Due to structural defects'''<ref>{{Cite book|last=Losowsky, M.S.|title=Malabsorption in clinical practice|publisher=Churchill Livingstone|year=1974|isbn=0-443-01007-2|location=Edinburgh}}</ref>
* [[Blind loop syndrome|Blind loops]]
* [[Fistulae]], [[Diverticulum|diverticula]] and [[strictures]]
* Infiltrative conditions such as [[amyloidosis]], [[lymphoma]], [[eosinophilic gastroenteritis]]
* Inflammatory bowel diseases, as in [[Crohn's disease]]
* [[Radiation enteritis]]
* [[Short bowel syndrome]]
* [[Systemic sclerosis]] and collagen vascular diseases
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|'''Due to surgical structural changes'''
* [[Weight loss surgery|Bariatric surgery (Weight loss surgery)]]
* [[Gastrectomy]]; [[Vagotomy]]
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|'''Due to mucosal abnormality'''
* [[Coeliac disease]]
* Cows' milk intolerance
* [[Fructose malabsorption]]
* Soya milk intolerance
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|'''Due to enzyme deficiencies'''
* Lactase deficiency inducing [[lactose intolerance]] (constitutional, secondary or rarely congenital)
* Intestinal disaccharidase deficiency
* Intestinal enteropeptidase deficiency
* [[Sucrose intolerance]]
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|'''Due to digestive failure'''
* Bile acid/[[Bile salt malabsorption]]
** [[Bacterial overgrowth]]
** [[Obstructive jaundice]]
** [[Primary bile acid diarrhea]]
** Terminal ileal disease such as Crohn's disease
* Pancreatic insufficiencies:
** [[Carcinoma of pancreas]]
** [[Chronic pancreatitis]]
** [[Cystic fibrosis]]
* [[Zollinger-Ellison syndrome]]
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|'''Due to other [[systemic disease]]s affecting GI tract'''
* [[Abetalipoproteinemia|Abetalipoproteinaemia]]
* [[Addison's disease]]
* [[Carcinoid syndrome]]
* [[Coeliac disease]]
* [[Common variable immunodeficiency|Common variable immunodeficiency (CVID)]]
* Fiber Deficiency
* [[Pernicious anemia]] (lack of [[intrinsic factor]], B<sub>12</sub> malabsorption)
* [[Hypothyroidism]] and [[hyperthyroidism]]
* [[Diabetes mellitus]]
* [[mast cell activation syndrome|Mast cell activation syndrome (MCAS)]]<ref name="PMID27012973">{{cite journal|vauthors=Afrin LB, Butterfield JH, Raithel M, Molderings GJ|title=Often seen, rarely recognized: mast cell activation disease--a guide to diagnosis and therapeutic options|journal=The American Journal of the Medical Science|volume=48|issue=3|date=2016|pages=190-201|DOI=10.3109/07853890.2016.1161231|PMID=27012973|url=|doi-access=free}}</ref>
* [[Hyperparathyroidism]] and [[Hypoparathyroidism]]
* Malnutrition
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|'''Other Possible Causes'''
* Chronic Proton Pump Inhibitor Use<ref>{{Cite journal|last=Heidelbaugh|first=Joel J.|date=June 2013|title=Proton pump inhibitors and risk of vitamin and mineral deficiency: evidence and clinical implications|journal=Therapeutic Advances in Drug Safety|volume=4|issue=3|pages=125–133|doi=10.1177/2042098613482484|issn=2042-0986|pmc=4110863|pmid=25083257}}</ref>
|}