The commonest pattern: the end of the small intestine and the colon together. Cramping in the lower right abdomen, diarrhoea, weight loss.
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The terminal ileum alone. The site where B12 and bile salts are absorbed — which is why deficiency shows up here first.
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Patchy inflammation of the upper small intestine. Cramping after meals, and malabsorption often severe out of proportion to the visible disease.
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Stomach and duodenum. Frequently mistaken for ulcer disease or gastritis for years before it is correctly identified.
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Colon only — Crohn's colitis. The pattern most often confused with ulcerative colitis, and the distinction changes the treatment.
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