Clinical features of small bowel malabsorption syndromes

Explanation:

In general PROXIMAL small bowel malabsoprtion syndromes present with chronic diarrhea and decreased Fe, folate, Ca, Mg.

Lactose intolerance is very common.

Bacterial overgrowth where B12 is deficient but Folate EXCESS is seen.

Whipple's disease where PAS positive coccobacilli (Trophyrema whippeli) are seen

GI lymphoma where thickened small bowel loops are seen.

DISTAL (Ileal) small bowel disease  typically presents with oxalate kidney stones, steattorhea, weight loss, B12 & fat soluble vitamin deficiencies. Examples include Crohn's disease and ileal resection.