How can somebody tell whether or not he has small intestine cancer?

Difficult diagnosis: Early diagnosis of small bowel carcinomas are difficult to diagnose in early stages, as most it is not accessible to endoscope.Capsule endoscopy is some help, contrast studies, ct scans will help.Late stages will present with obstruction, cramp y colicky pains , some time with bleeding. Occasionally laporoscopy even laporatomy is required for diagnosis.