Your small intestine does most of the digesting of the foods you eat. If you have a malabsorption syndrome, your small intestine cannot absorb nutrients from foods.
Causes of malabsorption syndromes include
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Celiac disease
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Lactose intolerance
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Short bowel syndrome, which happens after surgery to remove a large portion of the small intestine
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Whipple disease, a rare bacterial infection
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Genetic diseases
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Certain medicines
Treatment of malabsorption syndromes depends on the cause.
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Bassen-Kornzweig syndrome