Small bowel tumors are very uncommon and account for 3% to 6% of all gastrointestinal neoplasms. Practical application of videocapsule endoscopy and balloon-assisted enteroscopy have allowed to investigate and reveal neoplasmatic leasions in deep parts of gastrointestinal tract which earlier were hard to access. The modern techniques allow to evaluate the macroscopic picture of tumors more clearly, to determine its nature and location, take biopsy sample, to prescribe reasonable chemotherapy, to remove a tumor endoscopically or define indications for a planned surgical intervention. This article presents a widely overview over epidemiology, classification, clinical aspects, methods and diagnostic possibilities of different diagnostic techniques of revealing small bowel tumors, and own results of diagnosis and treatment of patients (n = 48) with small bowel tumors (2003-2010).